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<a href="QuEST__cpu__distributed_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Distributed under MIT licence. See https://github.com/QuEST-Kit/QuEST/blob/master/LICENCE.txt for details </span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>  </div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor"># include "<a class="code" href="QuEST_8h.html">QuEST.h</a>"</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor"># include "<a class="code" href="QuEST__internal_8h.html">QuEST_internal.h</a>"</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor"># include "<a class="code" href="QuEST__precision_8h.html">QuEST_precision.h</a>"</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor"># include "<a class="code" href="QuEST__validation_8h.html">QuEST_validation.h</a>"</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor"># include "<a class="code" href="mt19937ar_8h.html">mt19937ar.h</a>"</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  </div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor"># include "<a class="code" href="QuEST__cpu__internal_8h.html">QuEST_cpu_internal.h</a>"</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div>
<div class="line"><a name="l00020"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#ad3d8a3bd0c0b677acef144f2c2ef6d73"> 20</a></span> <span class="preprocessor"># define _BSD_SOURCE</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor"># include <unistd.h></span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor"># include <mpi.h></span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor"># include <stdlib.h></span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor"># include <stdio.h></span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor"># include <string.h></span> <span class="comment">// for memcpy</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor"># include <math.h></span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor"># include <time.h></span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor"># include <sys/types.h></span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  </div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor"># include <omp.h></span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  </div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  </div>
<div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#a7ebd3198a198f4cd20840f64fd8b84d0"> 35</a></span> <a class="code" href="structComplex.html">Complex</a> <a class="code" href="QuEST__cpu__distributed_8c.html#a7ebd3198a198f4cd20840f64fd8b84d0">statevec_calcInnerProduct</a>(<a class="code" href="structQureg.html">Qureg</a> bra, <a class="code" href="structQureg.html">Qureg</a> ket) {</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  </div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <a class="code" href="structComplex.html">Complex</a> localInnerProd = <a class="code" href="QuEST__cpu_8c.html#a6fbb3b693f25dde1e9e3dc87dc1984f7">statevec_calcInnerProductLocal</a>(bra, ket);</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">if</span> (bra.<a class="code" href="structQureg.html#aa3deb7163aab90a61e755a1f200f5413">numChunks</a> == 1)</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">return</span> localInnerProd;</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  </div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> localReal = localInnerProd.<a class="code" href="structComplex.html#ab5b2e2eca02131fc74b289a83636cbe3">real</a>;</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> localImag = localInnerProd.<a class="code" href="structComplex.html#a84f5439aad0ef495efdd3b4c1c02d27e">imag</a>;</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> globalReal, globalImag;</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  MPI_Allreduce(&localReal, &globalReal, 1, MPI_QuEST_REAL, MPI_SUM, MPI_COMM_WORLD);</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  MPI_Allreduce(&localImag, &globalImag, 1, MPI_QuEST_REAL, MPI_SUM, MPI_COMM_WORLD);</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  </div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <a class="code" href="structComplex.html">Complex</a> globalInnerProd;</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  globalInnerProd.<a class="code" href="structComplex.html#ab5b2e2eca02131fc74b289a83636cbe3">real</a> = globalReal;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  globalInnerProd.<a class="code" href="structComplex.html#a84f5439aad0ef495efdd3b4c1c02d27e">imag</a> = globalImag;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">return</span> globalInnerProd;</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> }</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  </div>
<div class="line"><a name="l00053"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#a6153547f245c05874161a105e9a2f02c"> 53</a></span> <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> <a class="code" href="QuEST__cpu__distributed_8c.html#a6153547f245c05874161a105e9a2f02c">densmatr_calcTotalProb</a>(<a class="code" href="structQureg.html">Qureg</a> qureg) {</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  </div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="comment">// computes the trace by summing every element ("diag") with global index (2^n + 1)i for i in [0, 2^n-1]</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  </div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="comment">// computes first local index containing a diagonal element</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> diagSpacing = 1LL + (1LL << qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numPrevDiags = (qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>>0)? 1+(qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>*qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>)/diagSpacing : 0;</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> globalIndNextDiag = diagSpacing * numPrevDiags;</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> localIndNextDiag = globalIndNextDiag % qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>;</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> index;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  </div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> rankTotal = 0;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> y, t, c;</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  c = 0;</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  </div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="comment">// iterates every local diagonal</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">for</span> (index=localIndNextDiag; index < qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>; index += diagSpacing) {</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  </div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="comment">// Kahan summation - brackets are important</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  y = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[index] - c;</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  t = rankTotal + y;</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  c = ( t - rankTotal ) - y;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  rankTotal = t;</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  }</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  </div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="comment">// combine each node's sum of diagonals</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> globalTotal;</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordflow">if</span> (qureg.<a class="code" href="structQureg.html#aa3deb7163aab90a61e755a1f200f5413">numChunks</a> > 1)</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  MPI_Allreduce(&rankTotal, &globalTotal, 1, MPI_QuEST_REAL, MPI_SUM, MPI_COMM_WORLD);</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  globalTotal = rankTotal;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  </div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">return</span> globalTotal;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> }</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  </div>
<div class="line"><a name="l00088"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#ad65ad1b5ea6f30b0c6b4ffda96e1a8e6"> 88</a></span> <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> <a class="code" href="QuEST__cpu__distributed_8c.html#ad65ad1b5ea6f30b0c6b4ffda96e1a8e6">statevec_calcTotalProb</a>(<a class="code" href="structQureg.html">Qureg</a> qureg){</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="comment">// Implemented using Kahan summation for greater accuracy at a slight floating</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="comment">// point operation overhead. For more details see https://en.wikipedia.org/wiki/Kahan_summation_algorithm</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> pTotal=0; </div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> y, t, c;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> allRankTotals=0;</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> index;</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numAmpsPerRank = qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>;</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  c = 0.0;</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordflow">for</span> (index=0; index<numAmpsPerRank; index++){ </div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="comment">// Perform pTotal+=qureg.stateVec.real[index]*qureg.stateVec.real[index]; by Kahan</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  y = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[index]*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[index] - c;</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  t = pTotal + y;</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="comment">// Don't change the bracketing on the following line</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  c = ( t - pTotal ) - y;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  pTotal = t;</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="comment">// Perform pTotal+=qureg.stateVec.imag[index]*qureg.stateVec.imag[index]; by Kahan</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  y = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[index]*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[index] - c;</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  t = pTotal + y;</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="comment">// Don't change the bracketing on the following line</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  c = ( t - pTotal ) - y;</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  pTotal = t;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  } </div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">if</span> (qureg.<a class="code" href="structQureg.html#aa3deb7163aab90a61e755a1f200f5413">numChunks</a>>1)</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  MPI_Allreduce(&pTotal, &allRankTotals, 1, MPI_QuEST_REAL, MPI_SUM, MPI_COMM_WORLD);</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">else</span> </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  allRankTotals=pTotal;</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  </div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">return</span> allRankTotals;</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> }</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  </div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  </div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#af0ea25f00987af4c53f17c9cca62ab41">isChunkToSkipInFindPZero</a>(<span class="keywordtype">int</span> chunkId, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> chunkSize, <span class="keywordtype">int</span> measureQubit);</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a0552889d6f57d9e0ed8b209bf426482d">chunkIsUpper</a>(<span class="keywordtype">int</span> chunkId, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> chunkSize, <span class="keywordtype">int</span> targetQubit);</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#aa3c2d644a2be7f0d3aa9f757527d306f">chunkIsUpperInOuterBlock</a>(<span class="keywordtype">int</span> chunkId, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> chunkSize, <span class="keywordtype">int</span> targetQubit, <span class="keywordtype">int</span> numQubits);</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu__distributed_8c.html#adb4b0373425b282abed27742d0ce0872">getRotAngle</a>(<span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a0552889d6f57d9e0ed8b209bf426482d">chunkIsUpper</a>, <a class="code" href="structComplex.html">Complex</a> *rot1, <a class="code" href="structComplex.html">Complex</a> *rot2, <a class="code" href="structComplex.html">Complex</a> alpha, <a class="code" href="structComplex.html">Complex</a> beta);</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a7dba097f23f5d48dfdc9f3250444e2e4">getChunkPairId</a>(<span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a0552889d6f57d9e0ed8b209bf426482d">chunkIsUpper</a>, <span class="keywordtype">int</span> chunkId, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> chunkSize, <span class="keywordtype">int</span> targetQubit);</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#ae66dc6569c6e4008c33d6739db422c08">getChunkOuterBlockPairId</a>(<span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a0552889d6f57d9e0ed8b209bf426482d">chunkIsUpper</a>, <span class="keywordtype">int</span> chunkId, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> chunkSize, <span class="keywordtype">int</span> targetQubit, <span class="keywordtype">int</span> numQubits);</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a4d043bb0cee54a5f94faf3ffc34a6790">halfMatrixBlockFitsInChunk</a>(<span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> chunkSize, <span class="keywordtype">int</span> targetQubit);</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a28be36627b2dd9a0da63dd6f60121b06">getChunkIdFromIndex</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> index);</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  </div>
<div class="line"><a name="l00129"></a><span class="lineno"><a class="line" href="group__type.html#ga8ba2c3388dd64d9348c3b091852d36d4"> 129</a></span> <a class="code" href="structQuESTEnv.html">QuESTEnv</a> <a class="code" href="group__type.html#ga8ba2c3388dd64d9348c3b091852d36d4">createQuESTEnv</a>(<span class="keywordtype">void</span>) {</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  </div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <a class="code" href="structQuESTEnv.html">QuESTEnv</a> env;</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  </div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="comment">// init MPI environment</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordtype">int</span> rank, numRanks, initialized;</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  MPI_Initialized(&initialized);</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">if</span> (!initialized){</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  MPI_Init(NULL, NULL);</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  MPI_Comm_size(MPI_COMM_WORLD, &numRanks);</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  MPI_Comm_rank(MPI_COMM_WORLD, &rank);</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  </div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  env.<a class="code" href="structQuESTEnv.html#aa648bb336cf8598467cb62db00b9cee8">rank</a>=rank;</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  env.<a class="code" href="structQuESTEnv.html#af22aacd7c9905accae28484785c193b4">numRanks</a>=numRanks;</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  </div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  </div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  printf(<span class="stringliteral">"ERROR: Trying to initialize QuESTEnv multiple times. Ignoring...\n"</span>);</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  </div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="comment">// ensure env is initialised anyway, so the compiler is happy</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  MPI_Comm_size(MPI_COMM_WORLD, &numRanks);</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  MPI_Comm_rank(MPI_COMM_WORLD, &rank);</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  env.<a class="code" href="structQuESTEnv.html#aa648bb336cf8598467cb62db00b9cee8">rank</a>=rank;</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  env.<a class="code" href="structQuESTEnv.html#af22aacd7c9905accae28484785c193b4">numRanks</a>=numRanks;</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  }</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  </div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <a class="code" href="QuEST__validation_8c.html#ad893327ebd2123508493d445868bfcd7">validateNumRanks</a>(env.<a class="code" href="structQuESTEnv.html#af22aacd7c9905accae28484785c193b4">numRanks</a>, __func__);</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  </div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <a class="code" href="group__debug.html#gaa8437ef3bf135231e2916e64dde1c94e">seedQuESTDefault</a>();</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  </div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keywordflow">return</span> env;</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> }</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  </div>
<div class="line"><a name="l00162"></a><span class="lineno"><a class="line" href="group__debug.html#ga8d31fe2d1ad4d01e2a1f5f6b8bc15b77"> 162</a></span> <span class="keywordtype">void</span> <a class="code" href="group__debug.html#ga8d31fe2d1ad4d01e2a1f5f6b8bc15b77">syncQuESTEnv</a>(<a class="code" href="structQuESTEnv.html">QuESTEnv</a> env){</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  MPI_Barrier(MPI_COMM_WORLD);</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> }</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  </div>
<div class="line"><a name="l00166"></a><span class="lineno"><a class="line" href="group__debug.html#gac7e38d768a1bd79019f88cc1e6295092"> 166</a></span> <span class="keywordtype">int</span> <a class="code" href="group__debug.html#gac7e38d768a1bd79019f88cc1e6295092">syncQuESTSuccess</a>(<span class="keywordtype">int</span> successCode){</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="keywordtype">int</span> totalSuccess;</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  MPI_Allreduce(&successCode, &totalSuccess, 1, MPI_INT, MPI_LAND, MPI_COMM_WORLD);</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="keywordflow">return</span> totalSuccess;</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> }</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  </div>
<div class="line"><a name="l00172"></a><span class="lineno"><a class="line" href="group__type.html#gaeff624226629d7063a8a776958a4f991"> 172</a></span> <span class="keywordtype">void</span> <a class="code" href="group__type.html#gaeff624226629d7063a8a776958a4f991">destroyQuESTEnv</a>(<a class="code" href="structQuESTEnv.html">QuESTEnv</a> env){</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="keywordtype">int</span> finalized;</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  MPI_Finalized(&finalized);</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keywordflow">if</span> (!finalized) MPI_Finalize();</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordflow">else</span> printf(<span class="stringliteral">"ERROR: Trying to close QuESTEnv multiple times. Ignoring\n"</span>);</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> }</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  </div>
<div class="line"><a name="l00179"></a><span class="lineno"><a class="line" href="group__debug.html#gaf8a14ae79c3fb2c0b5f6255cc37bebf9"> 179</a></span> <span class="keywordtype">void</span> <a class="code" href="group__debug.html#gaf8a14ae79c3fb2c0b5f6255cc37bebf9">reportQuESTEnv</a>(<a class="code" href="structQuESTEnv.html">QuESTEnv</a> env){</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keywordflow">if</span> (env.<a class="code" href="structQuESTEnv.html#aa648bb336cf8598467cb62db00b9cee8">rank</a>==0){</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  printf(<span class="stringliteral">"EXECUTION ENVIRONMENT:\n"</span>); </div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  printf(<span class="stringliteral">"Running distributed (MPI) version\n"</span>);</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  printf(<span class="stringliteral">"Number of ranks is %d\n"</span>, env.<a class="code" href="structQuESTEnv.html#af22aacd7c9905accae28484785c193b4">numRanks</a>);</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  printf(<span class="stringliteral">"OpenMP enabled\n"</span>);</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  printf(<span class="stringliteral">"Number of threads available is %d\n"</span>, omp_get_max_threads());</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> <span class="preprocessor"># else</span></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  printf(<span class="stringliteral">"OpenMP disabled\n"</span>);</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="preprocessor"># endif </span></div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  printf(<span class="stringliteral">"Precision: size of qreal is %ld bytes\n"</span>, <span class="keyword">sizeof</span>(<a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a>) );</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  }</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> }</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  </div>
<div class="line"><a name="l00194"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#a28be36627b2dd9a0da63dd6f60121b06"> 194</a></span> <span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a28be36627b2dd9a0da63dd6f60121b06">getChunkIdFromIndex</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> index){</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <span class="keywordflow">return</span> index/qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>; <span class="comment">// this is numAmpsPerChunk</span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> }</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  </div>
<div class="line"><a name="l00198"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#abc9a9ef4344c7faaaf28ac25c76649b9"> 198</a></span> <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> <a class="code" href="QuEST__cpu__distributed_8c.html#abc9a9ef4344c7faaaf28ac25c76649b9">statevec_getRealAmp</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> index){</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keywordtype">int</span> chunkId = <a class="code" href="QuEST__cpu__distributed_8c.html#a28be36627b2dd9a0da63dd6f60121b06">getChunkIdFromIndex</a>(qureg, index);</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> el; </div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="keywordflow">if</span> (qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>==chunkId){</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  el = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[index-chunkId*qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>];</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  }</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  MPI_Bcast(&el, 1, MPI_QuEST_REAL, chunkId, MPI_COMM_WORLD);</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <span class="keywordflow">return</span> el; </div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span> } </div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  </div>
<div class="line"><a name="l00208"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#abd509244d57657e148e4084c5ab5d28f"> 208</a></span> <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> <a class="code" href="QuEST__cpu__distributed_8c.html#abd509244d57657e148e4084c5ab5d28f">statevec_getImagAmp</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> index){</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="keywordtype">int</span> chunkId = <a class="code" href="QuEST__cpu__distributed_8c.html#a28be36627b2dd9a0da63dd6f60121b06">getChunkIdFromIndex</a>(qureg, index);</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> el; </div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="keywordflow">if</span> (qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>==chunkId){</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  el = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[index-chunkId*qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>];</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  }</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  MPI_Bcast(&el, 1, MPI_QuEST_REAL, chunkId, MPI_COMM_WORLD);</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="keywordflow">return</span> el; </div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> }</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  </div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a0552889d6f57d9e0ed8b209bf426482d">chunkIsUpper</a>(<span class="keywordtype">int</span> chunkId, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> chunkSize, <span class="keywordtype">int</span> targetQubit)</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> { </div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeHalfBlock = 1LL << (targetQubit);</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeBlock = sizeHalfBlock*2;</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> posInBlock = (chunkId*chunkSize) % sizeBlock;</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <span class="keywordflow">return</span> posInBlock<sizeHalfBlock;</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> }</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  </div>
<div class="line"><a name="l00236"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#aa3c2d644a2be7f0d3aa9f757527d306f"> 236</a></span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#aa3c2d644a2be7f0d3aa9f757527d306f">chunkIsUpperInOuterBlock</a>(<span class="keywordtype">int</span> chunkId, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> chunkSize, <span class="keywordtype">int</span> targetQubit, <span class="keywordtype">int</span> numQubits)</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span> { </div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeOuterHalfBlock = 1LL << (targetQubit+numQubits);</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeOuterBlock = sizeOuterHalfBlock*2;</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> posInBlock = (chunkId*chunkSize) % sizeOuterBlock;</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <span class="keywordflow">return</span> posInBlock<sizeOuterHalfBlock;</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span> }</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  </div>
<div class="line"><a name="l00258"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#adb4b0373425b282abed27742d0ce0872"> 258</a></span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu__distributed_8c.html#adb4b0373425b282abed27742d0ce0872">getRotAngle</a>(<span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a0552889d6f57d9e0ed8b209bf426482d">chunkIsUpper</a>, <a class="code" href="structComplex.html">Complex</a> *rot1, <a class="code" href="structComplex.html">Complex</a> *rot2, <a class="code" href="structComplex.html">Complex</a> alpha, <a class="code" href="structComplex.html">Complex</a> beta)</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span> {</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  <span class="keywordflow">if</span> (<a class="code" href="QuEST__cpu__distributed_8c.html#a0552889d6f57d9e0ed8b209bf426482d">chunkIsUpper</a>){</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  *rot1=alpha;</div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  rot2-><a class="code" href="structComplex.html#ab5b2e2eca02131fc74b289a83636cbe3">real</a>=-beta.<a class="code" href="structComplex.html#ab5b2e2eca02131fc74b289a83636cbe3">real</a>;</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  rot2-><a class="code" href="structComplex.html#a84f5439aad0ef495efdd3b4c1c02d27e">imag</a>=-beta.<a class="code" href="structComplex.html#a84f5439aad0ef495efdd3b4c1c02d27e">imag</a>;</div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  *rot1=beta;</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  *rot2=alpha;</div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  }</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span> }</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  </div>
<div class="line"><a name="l00283"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#a5c9b2f129bdffaaba9857f6eddecbb17"> 283</a></span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a5c9b2f129bdffaaba9857f6eddecbb17">getRotAngleFromUnitaryMatrix</a>(<span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a0552889d6f57d9e0ed8b209bf426482d">chunkIsUpper</a>, <a class="code" href="structComplex.html">Complex</a> *rot1, <a class="code" href="structComplex.html">Complex</a> *rot2, <a class="code" href="structComplexMatrix2.html">ComplexMatrix2</a> u)</div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span> {</div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  <span class="keywordflow">if</span> (<a class="code" href="QuEST__cpu__distributed_8c.html#a0552889d6f57d9e0ed8b209bf426482d">chunkIsUpper</a>){</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  *rot1=(<a class="code" href="structComplex.html">Complex</a>) {.<a class="code" href="structComplex.html#ab5b2e2eca02131fc74b289a83636cbe3">real</a>=u.<a class="code" href="structComplexMatrix2.html#a3ea98d545b67a190ee6abe936c72076f">real</a>[0][0], .imag=u.<a class="code" href="structComplexMatrix2.html#a3a2b60a9e00ccef054a6de3b9307c1be">imag</a>[0][0]};</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  *rot2=(<a class="code" href="structComplex.html">Complex</a>) {.<a class="code" href="structComplex.html#ab5b2e2eca02131fc74b289a83636cbe3">real</a>=u.<a class="code" href="structComplexMatrix2.html#a3ea98d545b67a190ee6abe936c72076f">real</a>[0][1], .imag=u.<a class="code" href="structComplexMatrix2.html#a3a2b60a9e00ccef054a6de3b9307c1be">imag</a>[0][1]};</div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  *rot1=(<a class="code" href="structComplex.html">Complex</a>) {.<a class="code" href="structComplex.html#ab5b2e2eca02131fc74b289a83636cbe3">real</a>=u.<a class="code" href="structComplexMatrix2.html#a3ea98d545b67a190ee6abe936c72076f">real</a>[1][0], .imag=u.<a class="code" href="structComplexMatrix2.html#a3a2b60a9e00ccef054a6de3b9307c1be">imag</a>[1][0]};</div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  *rot2=(<a class="code" href="structComplex.html">Complex</a>) {.<a class="code" href="structComplex.html#ab5b2e2eca02131fc74b289a83636cbe3">real</a>=u.<a class="code" href="structComplexMatrix2.html#a3ea98d545b67a190ee6abe936c72076f">real</a>[1][1], .imag=u.<a class="code" href="structComplexMatrix2.html#a3a2b60a9e00ccef054a6de3b9307c1be">imag</a>[1][1]};</div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  }</div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span> }</div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  </div>
<div class="line"><a name="l00303"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#a7dba097f23f5d48dfdc9f3250444e2e4"> 303</a></span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a7dba097f23f5d48dfdc9f3250444e2e4">getChunkPairId</a>(<span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a0552889d6f57d9e0ed8b209bf426482d">chunkIsUpper</a>, <span class="keywordtype">int</span> chunkId, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> chunkSize, <span class="keywordtype">int</span> targetQubit)</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span> {</div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeHalfBlock = 1LL << (targetQubit);</div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  <span class="keywordtype">int</span> chunksPerHalfBlock = sizeHalfBlock/chunkSize;</div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  <span class="keywordflow">if</span> (<a class="code" href="QuEST__cpu__distributed_8c.html#a0552889d6f57d9e0ed8b209bf426482d">chunkIsUpper</a>){</div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  <span class="keywordflow">return</span> chunkId + chunksPerHalfBlock;</div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  <span class="keywordflow">return</span> chunkId - chunksPerHalfBlock;</div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  }</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span> }</div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  </div>
<div class="line"><a name="l00314"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#ae66dc6569c6e4008c33d6739db422c08"> 314</a></span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#ae66dc6569c6e4008c33d6739db422c08">getChunkOuterBlockPairId</a>(<span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a0552889d6f57d9e0ed8b209bf426482d">chunkIsUpper</a>, <span class="keywordtype">int</span> chunkId, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> chunkSize, <span class="keywordtype">int</span> targetQubit, <span class="keywordtype">int</span> numQubits)</div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span> {</div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeOuterHalfBlock = 1LL << (targetQubit+numQubits);</div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  <span class="keywordtype">int</span> chunksPerOuterHalfBlock = sizeOuterHalfBlock/chunkSize;</div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  <span class="keywordflow">if</span> (<a class="code" href="QuEST__cpu__distributed_8c.html#a0552889d6f57d9e0ed8b209bf426482d">chunkIsUpper</a>){</div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  <span class="keywordflow">return</span> chunkId + chunksPerOuterHalfBlock;</div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  <span class="keywordflow">return</span> chunkId - chunksPerOuterHalfBlock;</div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  }</div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span> }</div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  </div>
<div class="line"><a name="l00325"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#ab1ec7f241b68b079c8e316d190af49ce"> 325</a></span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#ab1ec7f241b68b079c8e316d190af49ce">getChunkOuterBlockPairIdForPart3</a>(<span class="keywordtype">int</span> chunkIsUpperSmallerQubit, <span class="keywordtype">int</span> chunkIsUpperBiggerQubit, <span class="keywordtype">int</span> chunkId, </div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> chunkSize, <span class="keywordtype">int</span> smallerQubit, <span class="keywordtype">int</span> biggerQubit, <span class="keywordtype">int</span> numQubits)</div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span> {</div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeOuterHalfBlockBiggerQubit = 1LL << (biggerQubit+numQubits);</div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeOuterHalfBlockSmallerQubit = 1LL << (smallerQubit+numQubits);</div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  <span class="keywordtype">int</span> chunksPerOuterHalfBlockSmallerQubit = sizeOuterHalfBlockSmallerQubit/chunkSize;</div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  <span class="keywordtype">int</span> chunksPerOuterHalfBlockBiggerQubit = sizeOuterHalfBlockBiggerQubit/chunkSize;</div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  <span class="keywordtype">int</span> rank;</div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  <span class="keywordflow">if</span> (chunkIsUpperBiggerQubit){</div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  rank = chunkId + chunksPerOuterHalfBlockBiggerQubit;</div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  rank = chunkId - chunksPerOuterHalfBlockBiggerQubit;</div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  }</div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  </div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  <span class="keywordflow">if</span> (chunkIsUpperSmallerQubit){</div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  rank = rank + chunksPerOuterHalfBlockSmallerQubit;</div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  rank = rank - chunksPerOuterHalfBlockSmallerQubit;</div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  }</div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  </div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  <span class="keywordflow">return</span> rank;</div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span> }</div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  </div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a4d043bb0cee54a5f94faf3ffc34a6790">halfMatrixBlockFitsInChunk</a>(<span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> chunkSize, <span class="keywordtype">int</span> targetQubit)</div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span> {</div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeHalfBlock = 1LL << (targetQubit);</div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  <span class="keywordflow">if</span> (chunkSize > sizeHalfBlock) <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  <span class="keywordflow">else</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span> }</div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  </div>
<div class="line"><a name="l00363"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#a076fe6125da4d6037b8bc4d912df4015"> 363</a></span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a076fe6125da4d6037b8bc4d912df4015">densityMatrixBlockFitsInChunk</a>(<span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> chunkSize, <span class="keywordtype">int</span> numQubits, <span class="keywordtype">int</span> targetQubit) {</div>
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeOuterHalfBlock = 1LL << (targetQubit+numQubits);</div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  <span class="keywordflow">if</span> (chunkSize > sizeOuterHalfBlock) <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  <span class="keywordflow">else</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span> }</div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  </div>
<div class="line"><a name="l00371"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#a95af772d87c461fc8abfd6d47b752ac2"> 371</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a95af772d87c461fc8abfd6d47b752ac2">copyVecIntoMatrixPairState</a>(<a class="code" href="structQureg.html">Qureg</a> matr, <a class="code" href="structQureg.html">Qureg</a> vec) {</div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  </div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  <span class="comment">// Remember that for every amplitude that `vec` stores on the node,</span></div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  <span class="comment">// `matr` stores an entire column. Ergo there are always an integer</span></div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  <span class="comment">// number (in fact, a power of 2) number of `matr`s columns on each node.</span></div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  <span class="comment">// Since the total size of `vec` (between all nodes) is one column</span></div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  <span class="comment">// and each node stores (possibly) multiple columns (vec.numAmpsPerChunk as many), </span></div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  <span class="comment">// `vec` can be fit entirely inside a single node's matr.pairStateVec (with excess!)</span></div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  </div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  <span class="comment">// copy this node's vec segment into this node's matr pairState (in the right spot)</span></div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numLocalAmps = vec.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>;</div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> myOffset = vec.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a> * numLocalAmps;</div>
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span>  memcpy(&matr.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.real[myOffset], vec.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real, numLocalAmps * <span class="keyword">sizeof</span>(<a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a>));</div>
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  memcpy(&matr.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.imag[myOffset], vec.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag, numLocalAmps * <span class="keyword">sizeof</span>(<a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a>));</div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  </div>
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  <span class="comment">// we now want to share this node's vec segment with other node, so that </span></div>
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  <span class="comment">// vec is cloned in every node's matr.pairStateVec </span></div>
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  </div>
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  <span class="comment">// work out how many messages needed to send vec chunks (2GB limit)</span></div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> maxMsgSize = MPI_MAX_AMPS_IN_MSG;</div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  <span class="keywordflow">if</span> (numLocalAmps < maxMsgSize) </div>
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  maxMsgSize = numLocalAmps;</div>
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  <span class="comment">// safely assume MPI_MAX... = 2^n, so division always exact:</span></div>
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  <span class="keywordtype">int</span> numMsgs = numLocalAmps / maxMsgSize;</div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  </div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  <span class="comment">// every node gets a turn at being the broadcaster</span></div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> broadcaster=0; broadcaster < vec.<a class="code" href="structQureg.html#aa3deb7163aab90a61e755a1f200f5413">numChunks</a>; broadcaster++) {</div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  </div>
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> otherOffset = broadcaster * numLocalAmps;</div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  </div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  <span class="comment">// every node sends a slice of qureg's pairState to every other</span></div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=0; i< numMsgs; i++) {</div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  </div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  <span class="comment">// by sending that slice in further slices (due to bandwidth limit)</span></div>
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  MPI_Bcast(</div>
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  &matr.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.real[otherOffset + i*maxMsgSize], </div>
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  maxMsgSize, MPI_QuEST_REAL, broadcaster, MPI_COMM_WORLD);</div>
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  MPI_Bcast(</div>
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  &matr.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.imag[otherOffset + i*maxMsgSize], </div>
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span>  maxMsgSize, MPI_QuEST_REAL, broadcaster, MPI_COMM_WORLD);</div>
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  }</div>
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  }</div>
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span> }</div>
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  </div>
<div class="line"><a name="l00415"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#aa6c3f86010ad398f42b0577ea3bb5bcf"> 415</a></span> <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> <a class="code" href="QuEST__cpu__distributed_8c.html#aa6c3f86010ad398f42b0577ea3bb5bcf">densmatr_calcFidelity</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <a class="code" href="structQureg.html">Qureg</a> pureState) {</div>
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  </div>
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  <span class="comment">// set qureg's pairState is to be the full pureState (on every node)</span></div>
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a95af772d87c461fc8abfd6d47b752ac2">copyVecIntoMatrixPairState</a>(qureg, pureState);</div>
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  </div>
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span>  <span class="comment">// collect calcFidelityLocal by every machine</span></div>
<div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> localSum = <a class="code" href="QuEST__cpu_8c.html#a7772f97cb4d92a9825bf3b7c82c3230c">densmatr_calcFidelityLocal</a>(qureg, pureState);</div>
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  </div>
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span>  <span class="comment">// sum each localSum</span></div>
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> globalSum;</div>
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span>  MPI_Allreduce(&localSum, &globalSum, 1, MPI_QuEST_REAL, MPI_SUM, MPI_COMM_WORLD);</div>
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  </div>
<div class="line"><a name="l00427"></a><span class="lineno"> 427</span>  <span class="keywordflow">return</span> globalSum;</div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span> }</div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  </div>
<div class="line"><a name="l00430"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#a8c9da88f734b0862f4cce7d819e6d3b5"> 430</a></span> <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> <a class="code" href="QuEST__cpu__distributed_8c.html#a8c9da88f734b0862f4cce7d819e6d3b5">densmatr_calcHilbertSchmidtDistance</a>(<a class="code" href="structQureg.html">Qureg</a> a, <a class="code" href="structQureg.html">Qureg</a> b) {</div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  </div>
<div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> localSum = <a class="code" href="QuEST__cpu_8c.html#a939897137596bb73ad7a028d0beaaa10">densmatr_calcHilbertSchmidtDistanceSquaredLocal</a>(a, b);</div>
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  </div>
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> globalSum;</div>
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span>  MPI_Allreduce(&localSum, &globalSum, 1, MPI_QuEST_REAL, MPI_SUM, MPI_COMM_WORLD);</div>
<div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  </div>
<div class="line"><a name="l00437"></a><span class="lineno"> 437</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> dist = sqrt(globalSum);</div>
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span>  <span class="keywordflow">return</span> dist;</div>
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span> }</div>
<div class="line"><a name="l00440"></a><span class="lineno"> 440</span>  </div>
<div class="line"><a name="l00441"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#a6ff3dc624b5fafe8edae4fe327c255a0"> 441</a></span> <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> <a class="code" href="QuEST__cpu__distributed_8c.html#a6ff3dc624b5fafe8edae4fe327c255a0">densmatr_calcInnerProduct</a>(<a class="code" href="structQureg.html">Qureg</a> a, <a class="code" href="structQureg.html">Qureg</a> b) {</div>
<div class="line"><a name="l00442"></a><span class="lineno"> 442</span>  </div>
<div class="line"><a name="l00443"></a><span class="lineno"> 443</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> localSum = <a class="code" href="QuEST__cpu_8c.html#a08392b1b27d10e3b8a8648a5afeaa629">densmatr_calcInnerProductLocal</a>(a, b);</div>
<div class="line"><a name="l00444"></a><span class="lineno"> 444</span>  </div>
<div class="line"><a name="l00445"></a><span class="lineno"> 445</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> globalSum;</div>
<div class="line"><a name="l00446"></a><span class="lineno"> 446</span>  MPI_Allreduce(&localSum, &globalSum, 1, MPI_QuEST_REAL, MPI_SUM, MPI_COMM_WORLD);</div>
<div class="line"><a name="l00447"></a><span class="lineno"> 447</span>  </div>
<div class="line"><a name="l00448"></a><span class="lineno"> 448</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> dist = globalSum;</div>
<div class="line"><a name="l00449"></a><span class="lineno"> 449</span>  <span class="keywordflow">return</span> dist;</div>
<div class="line"><a name="l00450"></a><span class="lineno"> 450</span> }</div>
<div class="line"><a name="l00451"></a><span class="lineno"> 451</span>  </div>
<div class="line"><a name="l00452"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#ae5ad68d054875913d0f7ec654840a9ec"> 452</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu__distributed_8c.html#ae5ad68d054875913d0f7ec654840a9ec">densmatr_initPureState</a>(<a class="code" href="structQureg.html">Qureg</a> targetQureg, <a class="code" href="structQureg.html">Qureg</a> copyQureg) {</div>
<div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  </div>
<div class="line"><a name="l00454"></a><span class="lineno"> 454</span>  <span class="keywordflow">if</span> (targetQureg.<a class="code" href="structQureg.html#aa3deb7163aab90a61e755a1f200f5413">numChunks</a>==1){</div>
<div class="line"><a name="l00455"></a><span class="lineno"> 455</span>  <span class="comment">// local version</span></div>
<div class="line"><a name="l00456"></a><span class="lineno"> 456</span>  <span class="comment">// save pointers to qureg's pair state</span></div>
<div class="line"><a name="l00457"></a><span class="lineno"> 457</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a>* quregPairRePtr = targetQureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.real;</div>
<div class="line"><a name="l00458"></a><span class="lineno"> 458</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a>* quregPairImPtr = targetQureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.imag;</div>
<div class="line"><a name="l00459"></a><span class="lineno"> 459</span>  </div>
<div class="line"><a name="l00460"></a><span class="lineno"> 460</span>  <span class="comment">// populate qureg pair state with pure state (by repointing)</span></div>
<div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  targetQureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.real = copyQureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real;</div>
<div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  targetQureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.imag = copyQureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag;</div>
<div class="line"><a name="l00463"></a><span class="lineno"> 463</span>  </div>
<div class="line"><a name="l00464"></a><span class="lineno"> 464</span>  <span class="comment">// populate density matrix via it's pairState</span></div>
<div class="line"><a name="l00465"></a><span class="lineno"> 465</span>  <a class="code" href="QuEST__cpu_8c.html#a1b36518c8fbbc3a5084bb4ad1fb05ea5">densmatr_initPureStateLocal</a>(targetQureg, copyQureg);</div>
<div class="line"><a name="l00466"></a><span class="lineno"> 466</span>  </div>
<div class="line"><a name="l00467"></a><span class="lineno"> 467</span>  <span class="comment">// restore pointers</span></div>
<div class="line"><a name="l00468"></a><span class="lineno"> 468</span>  targetQureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.real = quregPairRePtr;</div>
<div class="line"><a name="l00469"></a><span class="lineno"> 469</span>  targetQureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.imag = quregPairImPtr;</div>
<div class="line"><a name="l00470"></a><span class="lineno"> 470</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00471"></a><span class="lineno"> 471</span>  <span class="comment">// set qureg's pairState is to be the full pure state (on every node)</span></div>
<div class="line"><a name="l00472"></a><span class="lineno"> 472</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a95af772d87c461fc8abfd6d47b752ac2">copyVecIntoMatrixPairState</a>(targetQureg, copyQureg);</div>
<div class="line"><a name="l00473"></a><span class="lineno"> 473</span>  </div>
<div class="line"><a name="l00474"></a><span class="lineno"> 474</span>  <span class="comment">// update every density matrix chunk using pairState</span></div>
<div class="line"><a name="l00475"></a><span class="lineno"> 475</span>  <a class="code" href="QuEST__cpu_8c.html#a1b36518c8fbbc3a5084bb4ad1fb05ea5">densmatr_initPureStateLocal</a>(targetQureg, copyQureg);</div>
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span>  }</div>
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span> }</div>
<div class="line"><a name="l00478"></a><span class="lineno"> 478</span>  </div>
<div class="line"><a name="l00479"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#ae01c3eb75fd32de1a7e1dbc7a33a21e3"> 479</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu__distributed_8c.html#ae01c3eb75fd32de1a7e1dbc7a33a21e3">exchangeStateVectors</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> pairRank){</div>
<div class="line"><a name="l00480"></a><span class="lineno"> 480</span>  <span class="comment">// MPI send/receive vars</span></div>
<div class="line"><a name="l00481"></a><span class="lineno"> 481</span>  <span class="keywordtype">int</span> TAG=100;</div>
<div class="line"><a name="l00482"></a><span class="lineno"> 482</span>  MPI_Status status;</div>
<div class="line"><a name="l00483"></a><span class="lineno"> 483</span>  </div>
<div class="line"><a name="l00484"></a><span class="lineno"> 484</span>  <span class="comment">// Multiple messages are required as MPI uses int rather than long long int for count</span></div>
<div class="line"><a name="l00485"></a><span class="lineno"> 485</span>  <span class="comment">// For openmpi, messages are further restricted to 2GB in size -- do this for all cases</span></div>
<div class="line"><a name="l00486"></a><span class="lineno"> 486</span>  <span class="comment">// to be safe</span></div>
<div class="line"><a name="l00487"></a><span class="lineno"> 487</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> maxMessageCount = MPI_MAX_AMPS_IN_MSG;</div>
<div class="line"><a name="l00488"></a><span class="lineno"> 488</span>  <span class="keywordflow">if</span> (qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a> < maxMessageCount) </div>
<div class="line"><a name="l00489"></a><span class="lineno"> 489</span>  maxMessageCount = qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>;</div>
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span>  </div>
<div class="line"><a name="l00491"></a><span class="lineno"> 491</span>  <span class="comment">// safely assume MPI_MAX... = 2^n, so division always exact</span></div>
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span>  <span class="keywordtype">int</span> numMessages = qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>/maxMessageCount;</div>
<div class="line"><a name="l00493"></a><span class="lineno"> 493</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00494"></a><span class="lineno"> 494</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> offset;</div>
<div class="line"><a name="l00495"></a><span class="lineno"> 495</span>  <span class="comment">// send my state vector to pairRank's qureg.pairStateVec</span></div>
<div class="line"><a name="l00496"></a><span class="lineno"> 496</span>  <span class="comment">// receive pairRank's state vector into qureg.pairStateVec</span></div>
<div class="line"><a name="l00497"></a><span class="lineno"> 497</span>  <span class="keywordflow">for</span> (i=0; i<numMessages; i++){</div>
<div class="line"><a name="l00498"></a><span class="lineno"> 498</span>  offset = i*maxMessageCount;</div>
<div class="line"><a name="l00499"></a><span class="lineno"> 499</span>  MPI_Sendrecv(&qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[offset], maxMessageCount, MPI_QuEST_REAL, pairRank, TAG,</div>
<div class="line"><a name="l00500"></a><span class="lineno"> 500</span>  &qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.real[offset], maxMessageCount, MPI_QuEST_REAL,</div>
<div class="line"><a name="l00501"></a><span class="lineno"> 501</span>  pairRank, TAG, MPI_COMM_WORLD, &status);</div>
<div class="line"><a name="l00502"></a><span class="lineno"> 502</span>  <span class="comment">//printf("rank: %d err: %d\n", qureg.rank, err);</span></div>
<div class="line"><a name="l00503"></a><span class="lineno"> 503</span>  MPI_Sendrecv(&qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[offset], maxMessageCount, MPI_QuEST_REAL, pairRank, TAG,</div>
<div class="line"><a name="l00504"></a><span class="lineno"> 504</span>  &qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.imag[offset], maxMessageCount, MPI_QuEST_REAL,</div>
<div class="line"><a name="l00505"></a><span class="lineno"> 505</span>  pairRank, TAG, MPI_COMM_WORLD, &status);</div>
<div class="line"><a name="l00506"></a><span class="lineno"> 506</span>  }</div>
<div class="line"><a name="l00507"></a><span class="lineno"> 507</span> }</div>
<div class="line"><a name="l00508"></a><span class="lineno"> 508</span>  </div>
<div class="line"><a name="l00509"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#a37dae401754961c9100b3c0907913c3e"> 509</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a37dae401754961c9100b3c0907913c3e">exchangePairStateVectorHalves</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> pairRank){</div>
<div class="line"><a name="l00510"></a><span class="lineno"> 510</span>  <span class="comment">// MPI send/receive vars</span></div>
<div class="line"><a name="l00511"></a><span class="lineno"> 511</span>  <span class="keywordtype">int</span> TAG=100;</div>
<div class="line"><a name="l00512"></a><span class="lineno"> 512</span>  MPI_Status status;</div>
<div class="line"><a name="l00513"></a><span class="lineno"> 513</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numAmpsToSend = qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a> >> 1;</div>
<div class="line"><a name="l00514"></a><span class="lineno"> 514</span>  </div>
<div class="line"><a name="l00515"></a><span class="lineno"> 515</span>  <span class="comment">// Multiple messages are required as MPI uses int rather than long long int for count</span></div>
<div class="line"><a name="l00516"></a><span class="lineno"> 516</span>  <span class="comment">// For openmpi, messages are further restricted to 2GB in size -- do this for all cases</span></div>
<div class="line"><a name="l00517"></a><span class="lineno"> 517</span>  <span class="comment">// to be safe</span></div>
<div class="line"><a name="l00518"></a><span class="lineno"> 518</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> maxMessageCount = MPI_MAX_AMPS_IN_MSG;</div>
<div class="line"><a name="l00519"></a><span class="lineno"> 519</span>  <span class="keywordflow">if</span> (numAmpsToSend < maxMessageCount) </div>
<div class="line"><a name="l00520"></a><span class="lineno"> 520</span>  maxMessageCount = numAmpsToSend;</div>
<div class="line"><a name="l00521"></a><span class="lineno"> 521</span>  </div>
<div class="line"><a name="l00522"></a><span class="lineno"> 522</span>  <span class="comment">// safely assume MPI_MAX... = 2^n, so division always exact</span></div>
<div class="line"><a name="l00523"></a><span class="lineno"> 523</span>  <span class="keywordtype">int</span> numMessages = numAmpsToSend/maxMessageCount;</div>
<div class="line"><a name="l00524"></a><span class="lineno"> 524</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00525"></a><span class="lineno"> 525</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> offset;</div>
<div class="line"><a name="l00526"></a><span class="lineno"> 526</span>  <span class="comment">// send the bottom half of my state vector to the top half of pairRank's qureg.pairStateVec</span></div>
<div class="line"><a name="l00527"></a><span class="lineno"> 527</span>  <span class="comment">// receive pairRank's state vector into the top of qureg.pairStateVec</span></div>
<div class="line"><a name="l00528"></a><span class="lineno"> 528</span>  <span class="keywordflow">for</span> (i=0; i<numMessages; i++){</div>
<div class="line"><a name="l00529"></a><span class="lineno"> 529</span>  offset = i*maxMessageCount;</div>
<div class="line"><a name="l00530"></a><span class="lineno"> 530</span>  MPI_Sendrecv(&qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.real[offset+numAmpsToSend], maxMessageCount, </div>
<div class="line"><a name="l00531"></a><span class="lineno"> 531</span>  MPI_QuEST_REAL, pairRank, TAG,</div>
<div class="line"><a name="l00532"></a><span class="lineno"> 532</span>  &qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.real[offset], maxMessageCount, MPI_QuEST_REAL,</div>
<div class="line"><a name="l00533"></a><span class="lineno"> 533</span>  pairRank, TAG, MPI_COMM_WORLD, &status);</div>
<div class="line"><a name="l00534"></a><span class="lineno"> 534</span>  <span class="comment">//printf("rank: %d err: %d\n", qureg.rank, err);</span></div>
<div class="line"><a name="l00535"></a><span class="lineno"> 535</span>  MPI_Sendrecv(&qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.imag[offset+numAmpsToSend], maxMessageCount, </div>
<div class="line"><a name="l00536"></a><span class="lineno"> 536</span>  MPI_QuEST_REAL, pairRank, TAG,</div>
<div class="line"><a name="l00537"></a><span class="lineno"> 537</span>  &qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.imag[offset], maxMessageCount, MPI_QuEST_REAL,</div>
<div class="line"><a name="l00538"></a><span class="lineno"> 538</span>  pairRank, TAG, MPI_COMM_WORLD, &status);</div>
<div class="line"><a name="l00539"></a><span class="lineno"> 539</span>  }</div>
<div class="line"><a name="l00540"></a><span class="lineno"> 540</span> }</div>
<div class="line"><a name="l00541"></a><span class="lineno"> 541</span>  </div>
<div class="line"><a name="l00542"></a><span class="lineno"> 542</span> <span class="comment">//TODO -- decide where this function should go. It is a preparation for MPI data transfer function</span></div>
<div class="line"><a name="l00543"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#a0eb14d48920ea469b0904ae63b47b589"> 543</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a0eb14d48920ea469b0904ae63b47b589">compressPairVectorForSingleQubitDepolarise</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> targetQubit){</div>
<div class="line"><a name="l00544"></a><span class="lineno"> 544</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeInnerBlock, sizeInnerHalfBlock;</div>
<div class="line"><a name="l00545"></a><span class="lineno"> 545</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeOuterColumn, sizeOuterHalfColumn;</div>
<div class="line"><a name="l00546"></a><span class="lineno"> 546</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisInnerBlock, <span class="comment">// current block</span></div>
<div class="line"><a name="l00547"></a><span class="lineno"> 547</span>  thisOuterColumn, <span class="comment">// current column in density matrix</span></div>
<div class="line"><a name="l00548"></a><span class="lineno"> 548</span>  thisIndex, <span class="comment">// current index in (density matrix representation) state vector</span></div>
<div class="line"><a name="l00549"></a><span class="lineno"> 549</span>  thisIndexInOuterColumn,</div>
<div class="line"><a name="l00550"></a><span class="lineno"> 550</span>  thisIndexInInnerBlock;</div>
<div class="line"><a name="l00551"></a><span class="lineno"> 551</span>  </div>
<div class="line"><a name="l00552"></a><span class="lineno"> 552</span>  <span class="keywordtype">int</span> outerBit;</div>
<div class="line"><a name="l00553"></a><span class="lineno"> 553</span>  </div>
<div class="line"><a name="l00554"></a><span class="lineno"> 554</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisTask;</div>
<div class="line"><a name="l00555"></a><span class="lineno"> 555</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numTasks=qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>>>1;</div>
<div class="line"><a name="l00556"></a><span class="lineno"> 556</span>  </div>
<div class="line"><a name="l00557"></a><span class="lineno"> 557</span>  <span class="comment">// set dimensions</span></div>
<div class="line"><a name="l00558"></a><span class="lineno"> 558</span>  sizeInnerHalfBlock = 1LL << targetQubit;</div>
<div class="line"><a name="l00559"></a><span class="lineno"> 559</span>  sizeInnerBlock = 2LL * sizeInnerHalfBlock;</div>
<div class="line"><a name="l00560"></a><span class="lineno"> 560</span>  sizeOuterHalfColumn = 1LL << qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>;</div>
<div class="line"><a name="l00561"></a><span class="lineno"> 561</span>  sizeOuterColumn = 2LL * sizeOuterHalfColumn;</div>
<div class="line"><a name="l00562"></a><span class="lineno"> 562</span>  </div>
<div class="line"><a name="l00563"></a><span class="lineno"> 563</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00564"></a><span class="lineno"> 564</span> <span class="preprocessor"># pragma omp parallel \</span></div>
<div class="line"><a name="l00565"></a><span class="lineno"> 565</span> <span class="preprocessor"> default (none) \</span></div>
<div class="line"><a name="l00566"></a><span class="lineno"> 566</span> <span class="preprocessor"> shared (sizeInnerBlock,sizeInnerHalfBlock,sizeOuterColumn,sizeOuterHalfColumn, \</span></div>
<div class="line"><a name="l00567"></a><span class="lineno"> 567</span> <span class="preprocessor"> qureg,numTasks,targetQubit) \</span></div>
<div class="line"><a name="l00568"></a><span class="lineno"> 568</span> <span class="preprocessor"> private (thisTask,thisInnerBlock,thisOuterColumn,thisIndex,thisIndexInOuterColumn, \</span></div>
<div class="line"><a name="l00569"></a><span class="lineno"> 569</span> <span class="preprocessor"> thisIndexInInnerBlock,outerBit) </span></div>
<div class="line"><a name="l00570"></a><span class="lineno"> 570</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00571"></a><span class="lineno"> 571</span>  {</div>
<div class="line"><a name="l00572"></a><span class="lineno"> 572</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00573"></a><span class="lineno"> 573</span> <span class="preprocessor"># pragma omp for schedule (static)</span></div>
<div class="line"><a name="l00574"></a><span class="lineno"> 574</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00575"></a><span class="lineno"> 575</span>  <span class="comment">// thisTask iterates over half the elements in this process' chunk of the density matrix</span></div>
<div class="line"><a name="l00576"></a><span class="lineno"> 576</span>  <span class="comment">// treat this as iterating over all columns, then iterating over half the values</span></div>
<div class="line"><a name="l00577"></a><span class="lineno"> 577</span>  <span class="comment">// within one column.</span></div>
<div class="line"><a name="l00578"></a><span class="lineno"> 578</span>  <span class="comment">// If this function has been called, this process' chunk contains half an </span></div>
<div class="line"><a name="l00579"></a><span class="lineno"> 579</span>  <span class="comment">// outer block or less</span></div>
<div class="line"><a name="l00580"></a><span class="lineno"> 580</span>  <span class="keywordflow">for</span> (thisTask=0; thisTask<numTasks; thisTask++) {</div>
<div class="line"><a name="l00581"></a><span class="lineno"> 581</span>  <span class="comment">// we want to process all columns in the density matrix,</span></div>
<div class="line"><a name="l00582"></a><span class="lineno"> 582</span>  <span class="comment">// updating the values for half of each column (one half of each inner block)</span></div>
<div class="line"><a name="l00583"></a><span class="lineno"> 583</span>  thisOuterColumn = thisTask / sizeOuterHalfColumn;</div>
<div class="line"><a name="l00584"></a><span class="lineno"> 584</span>  thisIndexInOuterColumn = thisTask&(sizeOuterHalfColumn-1); <span class="comment">// thisTask % sizeOuterHalfColumn</span></div>
<div class="line"><a name="l00585"></a><span class="lineno"> 585</span>  thisInnerBlock = thisIndexInOuterColumn/sizeInnerHalfBlock;</div>
<div class="line"><a name="l00586"></a><span class="lineno"> 586</span>  <span class="comment">// get index in state vector corresponding to upper inner block</span></div>
<div class="line"><a name="l00587"></a><span class="lineno"> 587</span>  thisIndexInInnerBlock = thisTask&(sizeInnerHalfBlock-1); <span class="comment">// thisTask % sizeInnerHalfBlock</span></div>
<div class="line"><a name="l00588"></a><span class="lineno"> 588</span>  thisIndex = thisOuterColumn*sizeOuterColumn + thisInnerBlock*sizeInnerBlock</div>
<div class="line"><a name="l00589"></a><span class="lineno"> 589</span>  + thisIndexInInnerBlock;</div>
<div class="line"><a name="l00590"></a><span class="lineno"> 590</span>  <span class="comment">// check if we are in the upper or lower half of an outer block</span></div>
<div class="line"><a name="l00591"></a><span class="lineno"> 591</span>  outerBit = <a class="code" href="QuEST__gpu_8cu.html#aec1852e1a8e70d3690919ce8ab551ba0">extractBit</a>(targetQubit, (thisIndex+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)>>qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00592"></a><span class="lineno"> 592</span>  <span class="comment">// if we are in the lower half of an outer block, shift to be in the lower half</span></div>
<div class="line"><a name="l00593"></a><span class="lineno"> 593</span>  <span class="comment">// of the inner block as well (we want to dephase |0><0| and |1><1| only)</span></div>
<div class="line"><a name="l00594"></a><span class="lineno"> 594</span>  thisIndex += outerBit*(sizeInnerHalfBlock);</div>
<div class="line"><a name="l00595"></a><span class="lineno"> 595</span>  </div>
<div class="line"><a name="l00596"></a><span class="lineno"> 596</span>  <span class="comment">// NOTE: at this point thisIndex should be the index of the element we want to </span></div>
<div class="line"><a name="l00597"></a><span class="lineno"> 597</span>  <span class="comment">// dephase in the chunk of the state vector on this process, in the </span></div>
<div class="line"><a name="l00598"></a><span class="lineno"> 598</span>  <span class="comment">// density matrix representation. </span></div>
<div class="line"><a name="l00599"></a><span class="lineno"> 599</span>  <span class="comment">// thisTask is the index of the pair element in pairStateVec</span></div>
<div class="line"><a name="l00600"></a><span class="lineno"> 600</span>  <span class="comment">// we will populate the second half of pairStateVec with this process'</span></div>
<div class="line"><a name="l00601"></a><span class="lineno"> 601</span>  <span class="comment">// data to send</span></div>
<div class="line"><a name="l00602"></a><span class="lineno"> 602</span>  </div>
<div class="line"><a name="l00603"></a><span class="lineno"> 603</span>  qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.real[thisTask+numTasks] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisIndex];</div>
<div class="line"><a name="l00604"></a><span class="lineno"> 604</span>  qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.imag[thisTask+numTasks] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisIndex];</div>
<div class="line"><a name="l00605"></a><span class="lineno"> 605</span>  </div>
<div class="line"><a name="l00606"></a><span class="lineno"> 606</span>  }</div>
<div class="line"><a name="l00607"></a><span class="lineno"> 607</span>  }</div>
<div class="line"><a name="l00608"></a><span class="lineno"> 608</span> }</div>
<div class="line"><a name="l00609"></a><span class="lineno"> 609</span>  </div>
<div class="line"><a name="l00610"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#a373394db1bf71b0be63585c0e9a52abb"> 610</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a373394db1bf71b0be63585c0e9a52abb">compressPairVectorForTwoQubitDepolarise</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> targetQubit,</div>
<div class="line"><a name="l00611"></a><span class="lineno"> 611</span>  <span class="keywordtype">int</span> qubit2) {</div>
<div class="line"><a name="l00612"></a><span class="lineno"> 612</span>  </div>
<div class="line"><a name="l00613"></a><span class="lineno"> 613</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeInnerBlockQ1, sizeInnerHalfBlockQ1;</div>
<div class="line"><a name="l00614"></a><span class="lineno"> 614</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeInnerBlockQ2, sizeInnerHalfBlockQ2, sizeInnerQuarterBlockQ2;</div>
<div class="line"><a name="l00615"></a><span class="lineno"> 615</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeOuterColumn, sizeOuterQuarterColumn;</div>
<div class="line"><a name="l00616"></a><span class="lineno"> 616</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> </div>
<div class="line"><a name="l00617"></a><span class="lineno"> 617</span>  thisInnerBlockQ2,</div>
<div class="line"><a name="l00618"></a><span class="lineno"> 618</span>  thisOuterColumn, <span class="comment">// current column in density matrix</span></div>
<div class="line"><a name="l00619"></a><span class="lineno"> 619</span>  thisIndex, <span class="comment">// current index in (density matrix representation) state vector</span></div>
<div class="line"><a name="l00620"></a><span class="lineno"> 620</span>  thisIndexInOuterColumn,</div>
<div class="line"><a name="l00621"></a><span class="lineno"> 621</span>  thisIndexInInnerBlockQ1,</div>
<div class="line"><a name="l00622"></a><span class="lineno"> 622</span>  thisIndexInInnerBlockQ2,</div>
<div class="line"><a name="l00623"></a><span class="lineno"> 623</span>  thisInnerBlockQ1InInnerBlockQ2;</div>
<div class="line"><a name="l00624"></a><span class="lineno"> 624</span>  <span class="keywordtype">int</span> outerBitQ1, outerBitQ2;</div>
<div class="line"><a name="l00625"></a><span class="lineno"> 625</span>  </div>
<div class="line"><a name="l00626"></a><span class="lineno"> 626</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisTask;</div>
<div class="line"><a name="l00627"></a><span class="lineno"> 627</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numTasks=qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>>>2;</div>
<div class="line"><a name="l00628"></a><span class="lineno"> 628</span>  </div>
<div class="line"><a name="l00629"></a><span class="lineno"> 629</span>  <span class="comment">// set dimensions</span></div>
<div class="line"><a name="l00630"></a><span class="lineno"> 630</span>  sizeInnerHalfBlockQ1 = 1LL << targetQubit;</div>
<div class="line"><a name="l00631"></a><span class="lineno"> 631</span>  sizeInnerHalfBlockQ2 = 1LL << qubit2;</div>
<div class="line"><a name="l00632"></a><span class="lineno"> 632</span>  sizeInnerQuarterBlockQ2 = sizeInnerHalfBlockQ2 >> 1;</div>
<div class="line"><a name="l00633"></a><span class="lineno"> 633</span>  sizeInnerBlockQ2 = sizeInnerHalfBlockQ2 << 1;</div>
<div class="line"><a name="l00634"></a><span class="lineno"> 634</span>  sizeInnerBlockQ1 = 2LL * sizeInnerHalfBlockQ1;</div>
<div class="line"><a name="l00635"></a><span class="lineno"> 635</span>  sizeOuterColumn = 1LL << qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>;</div>
<div class="line"><a name="l00636"></a><span class="lineno"> 636</span>  sizeOuterQuarterColumn = sizeOuterColumn >> 2;</div>
<div class="line"><a name="l00637"></a><span class="lineno"> 637</span>  </div>
<div class="line"><a name="l00638"></a><span class="lineno"> 638</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00639"></a><span class="lineno"> 639</span> <span class="preprocessor"># pragma omp parallel \</span></div>
<div class="line"><a name="l00640"></a><span class="lineno"> 640</span> <span class="preprocessor"> default (none) \</span></div>
<div class="line"><a name="l00641"></a><span class="lineno"> 641</span> <span class="preprocessor"> shared (sizeInnerBlockQ1,sizeInnerHalfBlockQ1,sizeInnerQuarterBlockQ2,sizeInnerHalfBlockQ2,sizeInnerBlockQ2, \</span></div>
<div class="line"><a name="l00642"></a><span class="lineno"> 642</span> <span class="preprocessor"> sizeOuterColumn,sizeOuterQuarterColumn,qureg,numTasks,targetQubit,qubit2) \</span></div>
<div class="line"><a name="l00643"></a><span class="lineno"> 643</span> <span class="preprocessor"> private (thisTask,thisInnerBlockQ2,thisOuterColumn,thisIndex,thisIndexInOuterColumn, \</span></div>
<div class="line"><a name="l00644"></a><span class="lineno"> 644</span> <span class="preprocessor"> thisIndexInInnerBlockQ1,thisIndexInInnerBlockQ2,thisInnerBlockQ1InInnerBlockQ2,outerBitQ1,outerBitQ2) </span></div>
<div class="line"><a name="l00645"></a><span class="lineno"> 645</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00646"></a><span class="lineno"> 646</span>  {</div>
<div class="line"><a name="l00647"></a><span class="lineno"> 647</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00648"></a><span class="lineno"> 648</span> <span class="preprocessor"># pragma omp for schedule (static)</span></div>
<div class="line"><a name="l00649"></a><span class="lineno"> 649</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00650"></a><span class="lineno"> 650</span>  <span class="comment">// thisTask iterates over half the elements in this process' chunk of the density matrix</span></div>
<div class="line"><a name="l00651"></a><span class="lineno"> 651</span>  <span class="comment">// treat this as iterating over all columns, then iterating over half the values</span></div>
<div class="line"><a name="l00652"></a><span class="lineno"> 652</span>  <span class="comment">// within one column.</span></div>
<div class="line"><a name="l00653"></a><span class="lineno"> 653</span>  <span class="comment">// If this function has been called, this process' chunk contains half an </span></div>
<div class="line"><a name="l00654"></a><span class="lineno"> 654</span>  <span class="comment">// outer block or less</span></div>
<div class="line"><a name="l00655"></a><span class="lineno"> 655</span>  <span class="keywordflow">for</span> (thisTask=0; thisTask<numTasks; thisTask++) {</div>
<div class="line"><a name="l00656"></a><span class="lineno"> 656</span>  <span class="comment">// we want to process all columns in the density matrix,</span></div>
<div class="line"><a name="l00657"></a><span class="lineno"> 657</span>  <span class="comment">// updating the values for half of each column (one half of each inner block)</span></div>
<div class="line"><a name="l00658"></a><span class="lineno"> 658</span>  thisOuterColumn = thisTask / sizeOuterQuarterColumn;</div>
<div class="line"><a name="l00659"></a><span class="lineno"> 659</span>  <span class="comment">// thisTask % sizeOuterQuarterColumn</span></div>
<div class="line"><a name="l00660"></a><span class="lineno"> 660</span>  thisIndexInOuterColumn = thisTask&(sizeOuterQuarterColumn-1);</div>
<div class="line"><a name="l00661"></a><span class="lineno"> 661</span>  thisInnerBlockQ2 = thisIndexInOuterColumn / sizeInnerQuarterBlockQ2;</div>
<div class="line"><a name="l00662"></a><span class="lineno"> 662</span>  <span class="comment">// thisTask % sizeInnerQuarterBlockQ2;</span></div>
<div class="line"><a name="l00663"></a><span class="lineno"> 663</span>  thisIndexInInnerBlockQ2 = thisTask&(sizeInnerQuarterBlockQ2-1);</div>
<div class="line"><a name="l00664"></a><span class="lineno"> 664</span>  thisInnerBlockQ1InInnerBlockQ2 = thisIndexInInnerBlockQ2 / sizeInnerHalfBlockQ1;</div>
<div class="line"><a name="l00665"></a><span class="lineno"> 665</span>  <span class="comment">// thisTask % sizeInnerHalfBlockQ1;</span></div>
<div class="line"><a name="l00666"></a><span class="lineno"> 666</span>  thisIndexInInnerBlockQ1 = thisTask&(sizeInnerHalfBlockQ1-1);</div>
<div class="line"><a name="l00667"></a><span class="lineno"> 667</span>  </div>
<div class="line"><a name="l00668"></a><span class="lineno"> 668</span>  <span class="comment">// get index in state vector corresponding to upper inner block</span></div>
<div class="line"><a name="l00669"></a><span class="lineno"> 669</span>  thisIndex = thisOuterColumn*sizeOuterColumn + thisInnerBlockQ2*sizeInnerBlockQ2</div>
<div class="line"><a name="l00670"></a><span class="lineno"> 670</span>  + thisInnerBlockQ1InInnerBlockQ2*sizeInnerBlockQ1 + thisIndexInInnerBlockQ1;</div>
<div class="line"><a name="l00671"></a><span class="lineno"> 671</span>  </div>
<div class="line"><a name="l00672"></a><span class="lineno"> 672</span>  <span class="comment">// check if we are in the upper or lower half of an outer block for Q1</span></div>
<div class="line"><a name="l00673"></a><span class="lineno"> 673</span>  outerBitQ1 = <a class="code" href="QuEST__gpu_8cu.html#aec1852e1a8e70d3690919ce8ab551ba0">extractBit</a>(targetQubit, (thisIndex+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)>>qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00674"></a><span class="lineno"> 674</span>  <span class="comment">// if we are in the lower half of an outer block, shift to be in the lower half</span></div>
<div class="line"><a name="l00675"></a><span class="lineno"> 675</span>  <span class="comment">// of the inner block as well (we want to dephase |0><0| and |1><1| only)</span></div>
<div class="line"><a name="l00676"></a><span class="lineno"> 676</span>  thisIndex += outerBitQ1*(sizeInnerHalfBlockQ1);</div>
<div class="line"><a name="l00677"></a><span class="lineno"> 677</span>  </div>
<div class="line"><a name="l00678"></a><span class="lineno"> 678</span>  <span class="comment">// check if we are in the upper or lower half of an outer block for Q2</span></div>
<div class="line"><a name="l00679"></a><span class="lineno"> 679</span>  outerBitQ2 = <a class="code" href="QuEST__gpu_8cu.html#aec1852e1a8e70d3690919ce8ab551ba0">extractBit</a>(qubit2, (thisIndex+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)>>qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00680"></a><span class="lineno"> 680</span>  <span class="comment">// if we are in the lower half of an outer block, shift to be in the lower half</span></div>
<div class="line"><a name="l00681"></a><span class="lineno"> 681</span>  <span class="comment">// of the inner block as well (we want to dephase |0><0| and |1><1| only)</span></div>
<div class="line"><a name="l00682"></a><span class="lineno"> 682</span>  thisIndex += outerBitQ2*(sizeInnerQuarterBlockQ2<<1);</div>
<div class="line"><a name="l00683"></a><span class="lineno"> 683</span>  </div>
<div class="line"><a name="l00684"></a><span class="lineno"> 684</span>  <span class="comment">// NOTE: at this point thisIndex should be the index of the element we want to </span></div>
<div class="line"><a name="l00685"></a><span class="lineno"> 685</span>  <span class="comment">// dephase in the chunk of the state vector on this process, in the </span></div>
<div class="line"><a name="l00686"></a><span class="lineno"> 686</span>  <span class="comment">// density matrix representation. </span></div>
<div class="line"><a name="l00687"></a><span class="lineno"> 687</span>  <span class="comment">// thisTask is the index of the pair element in pairStateVec</span></div>
<div class="line"><a name="l00688"></a><span class="lineno"> 688</span>  </div>
<div class="line"><a name="l00689"></a><span class="lineno"> 689</span>  <span class="comment">// state[thisIndex] = (1-depolLevel)*state[thisIndex] + depolLevel*(state[thisIndex]</span></div>
<div class="line"><a name="l00690"></a><span class="lineno"> 690</span>  <span class="comment">// + pair[thisTask])/2</span></div>
<div class="line"><a name="l00691"></a><span class="lineno"> 691</span>  qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.real[thisTask+numTasks*2] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisIndex];</div>
<div class="line"><a name="l00692"></a><span class="lineno"> 692</span>  qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.imag[thisTask+numTasks*2] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisIndex];</div>
<div class="line"><a name="l00693"></a><span class="lineno"> 693</span>  }</div>
<div class="line"><a name="l00694"></a><span class="lineno"> 694</span>  }</div>
<div class="line"><a name="l00695"></a><span class="lineno"> 695</span> }</div>
<div class="line"><a name="l00696"></a><span class="lineno"> 696</span>  </div>
<div class="line"><a name="l00697"></a><span class="lineno"> 697</span>  </div>
<div class="line"><a name="l00698"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#a398b60c4cb4fa2cf2ffc126de6c08da0"> 698</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a398b60c4cb4fa2cf2ffc126de6c08da0">densmatr_mixDepolarising</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> targetQubit, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> depolLevel) {</div>
<div class="line"><a name="l00699"></a><span class="lineno"> 699</span>  <span class="keywordflow">if</span> (depolLevel == 0)</div>
<div class="line"><a name="l00700"></a><span class="lineno"> 700</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00701"></a><span class="lineno"> 701</span>  </div>
<div class="line"><a name="l00702"></a><span class="lineno"> 702</span>  <span class="keywordtype">int</span> rankIsUpper; <span class="comment">// rank is in the upper half of an outer block</span></div>
<div class="line"><a name="l00703"></a><span class="lineno"> 703</span>  <span class="keywordtype">int</span> pairRank; <span class="comment">// rank of corresponding chunk</span></div>
<div class="line"><a name="l00704"></a><span class="lineno"> 704</span>  </div>
<div class="line"><a name="l00705"></a><span class="lineno"> 705</span>  <span class="keywordtype">int</span> useLocalDataOnly = <a class="code" href="QuEST__cpu__distributed_8c.html#a076fe6125da4d6037b8bc4d912df4015">densityMatrixBlockFitsInChunk</a>(qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, </div>
<div class="line"><a name="l00706"></a><span class="lineno"> 706</span>  qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>, targetQubit);</div>
<div class="line"><a name="l00707"></a><span class="lineno"> 707</span>  </div>
<div class="line"><a name="l00708"></a><span class="lineno"> 708</span>  <span class="keywordflow">if</span> (useLocalDataOnly){</div>
<div class="line"><a name="l00709"></a><span class="lineno"> 709</span>  <a class="code" href="QuEST__cpu_8c.html#ab750fb47da2fca9849c678c869e40e69">densmatr_mixDepolarisingLocal</a>(qureg, targetQubit, depolLevel);</div>
<div class="line"><a name="l00710"></a><span class="lineno"> 710</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00711"></a><span class="lineno"> 711</span>  <span class="comment">// pack data to send to my pair process into the first half of pairStateVec</span></div>
<div class="line"><a name="l00712"></a><span class="lineno"> 712</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a0eb14d48920ea469b0904ae63b47b589">compressPairVectorForSingleQubitDepolarise</a>(qureg, targetQubit);</div>
<div class="line"><a name="l00713"></a><span class="lineno"> 713</span>  </div>
<div class="line"><a name="l00714"></a><span class="lineno"> 714</span>  rankIsUpper = <a class="code" href="QuEST__cpu__distributed_8c.html#aa3c2d644a2be7f0d3aa9f757527d306f">chunkIsUpperInOuterBlock</a>(qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, targetQubit, </div>
<div class="line"><a name="l00715"></a><span class="lineno"> 715</span>  qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00716"></a><span class="lineno"> 716</span>  pairRank = <a class="code" href="QuEST__cpu__distributed_8c.html#ae66dc6569c6e4008c33d6739db422c08">getChunkOuterBlockPairId</a>(rankIsUpper, qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, </div>
<div class="line"><a name="l00717"></a><span class="lineno"> 717</span>  targetQubit, qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00718"></a><span class="lineno"> 718</span>  </div>
<div class="line"><a name="l00719"></a><span class="lineno"> 719</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a37dae401754961c9100b3c0907913c3e">exchangePairStateVectorHalves</a>(qureg, pairRank);</div>
<div class="line"><a name="l00720"></a><span class="lineno"> 720</span>  <a class="code" href="QuEST__cpu_8c.html#a88670d0e7cebe33f61c1dd98daa338b3">densmatr_mixDepolarisingDistributed</a>(qureg, targetQubit, depolLevel);</div>
<div class="line"><a name="l00721"></a><span class="lineno"> 721</span>  }</div>
<div class="line"><a name="l00722"></a><span class="lineno"> 722</span>  </div>
<div class="line"><a name="l00723"></a><span class="lineno"> 723</span> }</div>
<div class="line"><a name="l00724"></a><span class="lineno"> 724</span>  </div>
<div class="line"><a name="l00725"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#ac501fe7b9d331be48359ce1546348f97"> 725</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu__distributed_8c.html#ac501fe7b9d331be48359ce1546348f97">densmatr_mixDamping</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> targetQubit, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> damping) {</div>
<div class="line"><a name="l00726"></a><span class="lineno"> 726</span>  <span class="keywordflow">if</span> (damping == 0)</div>
<div class="line"><a name="l00727"></a><span class="lineno"> 727</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00728"></a><span class="lineno"> 728</span>  </div>
<div class="line"><a name="l00729"></a><span class="lineno"> 729</span>  <span class="keywordtype">int</span> rankIsUpper; <span class="comment">// rank is in the upper half of an outer block</span></div>
<div class="line"><a name="l00730"></a><span class="lineno"> 730</span>  <span class="keywordtype">int</span> pairRank; <span class="comment">// rank of corresponding chunk</span></div>
<div class="line"><a name="l00731"></a><span class="lineno"> 731</span>  </div>
<div class="line"><a name="l00732"></a><span class="lineno"> 732</span>  <span class="keywordtype">int</span> useLocalDataOnly = <a class="code" href="QuEST__cpu__distributed_8c.html#a076fe6125da4d6037b8bc4d912df4015">densityMatrixBlockFitsInChunk</a>(qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, </div>
<div class="line"><a name="l00733"></a><span class="lineno"> 733</span>  qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>, targetQubit);</div>
<div class="line"><a name="l00734"></a><span class="lineno"> 734</span>  </div>
<div class="line"><a name="l00735"></a><span class="lineno"> 735</span>  <span class="keywordflow">if</span> (useLocalDataOnly){</div>
<div class="line"><a name="l00736"></a><span class="lineno"> 736</span>  <a class="code" href="QuEST__cpu_8c.html#ab124a3a9956046bf9c0e1e3ae9171f42">densmatr_mixDampingLocal</a>(qureg, targetQubit, damping);</div>
<div class="line"><a name="l00737"></a><span class="lineno"> 737</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00738"></a><span class="lineno"> 738</span>  <span class="comment">// pack data to send to my pair process into the first half of pairStateVec</span></div>
<div class="line"><a name="l00739"></a><span class="lineno"> 739</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a0eb14d48920ea469b0904ae63b47b589">compressPairVectorForSingleQubitDepolarise</a>(qureg, targetQubit);</div>
<div class="line"><a name="l00740"></a><span class="lineno"> 740</span>  </div>
<div class="line"><a name="l00741"></a><span class="lineno"> 741</span>  rankIsUpper = <a class="code" href="QuEST__cpu__distributed_8c.html#aa3c2d644a2be7f0d3aa9f757527d306f">chunkIsUpperInOuterBlock</a>(qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, targetQubit, </div>
<div class="line"><a name="l00742"></a><span class="lineno"> 742</span>  qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00743"></a><span class="lineno"> 743</span>  pairRank = <a class="code" href="QuEST__cpu__distributed_8c.html#ae66dc6569c6e4008c33d6739db422c08">getChunkOuterBlockPairId</a>(rankIsUpper, qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, </div>
<div class="line"><a name="l00744"></a><span class="lineno"> 744</span>  targetQubit, qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00745"></a><span class="lineno"> 745</span>  </div>
<div class="line"><a name="l00746"></a><span class="lineno"> 746</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a37dae401754961c9100b3c0907913c3e">exchangePairStateVectorHalves</a>(qureg, pairRank);</div>
<div class="line"><a name="l00747"></a><span class="lineno"> 747</span>  <a class="code" href="QuEST__cpu_8c.html#a8d9c19a3424f0ad89bfbfd920d65301d">densmatr_mixDampingDistributed</a>(qureg, targetQubit, damping);</div>
<div class="line"><a name="l00748"></a><span class="lineno"> 748</span>  }</div>
<div class="line"><a name="l00749"></a><span class="lineno"> 749</span>  </div>
<div class="line"><a name="l00750"></a><span class="lineno"> 750</span> }</div>
<div class="line"><a name="l00751"></a><span class="lineno"> 751</span>  </div>
<div class="line"><a name="l00752"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#a43afa97e300b87bce7f3eb1213eb05f6"> 752</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a43afa97e300b87bce7f3eb1213eb05f6">densmatr_mixTwoQubitDepolarising</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> qubit1, <span class="keywordtype">int</span> qubit2, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> depolLevel){</div>
<div class="line"><a name="l00753"></a><span class="lineno"> 753</span>  <span class="keywordflow">if</span> (depolLevel == 0)</div>
<div class="line"><a name="l00754"></a><span class="lineno"> 754</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00755"></a><span class="lineno"> 755</span>  <span class="keywordtype">int</span> rankIsUpperBiggerQubit, rankIsUpperSmallerQubit;</div>
<div class="line"><a name="l00756"></a><span class="lineno"> 756</span>  <span class="keywordtype">int</span> pairRank; <span class="comment">// rank of corresponding chunk</span></div>
<div class="line"><a name="l00757"></a><span class="lineno"> 757</span>  <span class="keywordtype">int</span> biggerQubit, smallerQubit;</div>
<div class="line"><a name="l00758"></a><span class="lineno"> 758</span>  </div>
<div class="line"><a name="l00759"></a><span class="lineno"> 759</span>  <a class="code" href="QuEST__internal_8h.html#a623e577b7230f3c8dc202be6185b4289">densmatr_mixTwoQubitDephasing</a>(qureg, qubit1, qubit2, depolLevel);</div>
<div class="line"><a name="l00760"></a><span class="lineno"> 760</span>  </div>
<div class="line"><a name="l00761"></a><span class="lineno"> 761</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> eta = 2/depolLevel;</div>
<div class="line"><a name="l00762"></a><span class="lineno"> 762</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> delta = eta - 1 - sqrt( (eta-1)*(eta-1) - 1 ); </div>
<div class="line"><a name="l00763"></a><span class="lineno"> 763</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> gamma = 1+delta;</div>
<div class="line"><a name="l00764"></a><span class="lineno"> 764</span>  gamma = 1/(gamma*gamma*gamma);</div>
<div class="line"><a name="l00765"></a><span class="lineno"> 765</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> GAMMA_PARTS_1_OR_2 = 1.0;</div>
<div class="line"><a name="l00766"></a><span class="lineno"> 766</span>  <span class="comment">// TODO -- test delta too small</span></div>
<div class="line"><a name="l00767"></a><span class="lineno"> 767</span>  <span class="comment">/* </span></div>
<div class="line"><a name="l00768"></a><span class="lineno"> 768</span> <span class="comment"> if (fabs(4*delta*(1+delta)*gamma-depolLevel)>1e-5){</span></div>
<div class="line"><a name="l00769"></a><span class="lineno"> 769</span> <span class="comment"> printf("Numerical error in delta; for small error rates try Taylor expansion.\n");</span></div>
<div class="line"><a name="l00770"></a><span class="lineno"> 770</span> <span class="comment"> exit(1);</span></div>
<div class="line"><a name="l00771"></a><span class="lineno"> 771</span> <span class="comment"> }</span></div>
<div class="line"><a name="l00772"></a><span class="lineno"> 772</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00773"></a><span class="lineno"> 773</span>  </div>
<div class="line"><a name="l00774"></a><span class="lineno"> 774</span>  biggerQubit = qubit1 > qubit2 ? qubit1 : qubit2;</div>
<div class="line"><a name="l00775"></a><span class="lineno"> 775</span>  smallerQubit = qubit1 < qubit2 ? qubit1 : qubit2;</div>
<div class="line"><a name="l00776"></a><span class="lineno"> 776</span>  <span class="keywordtype">int</span> useLocalDataOnlyBigQubit, useLocalDataOnlySmallQubit;</div>
<div class="line"><a name="l00777"></a><span class="lineno"> 777</span>  </div>
<div class="line"><a name="l00778"></a><span class="lineno"> 778</span>  useLocalDataOnlyBigQubit = <a class="code" href="QuEST__cpu__distributed_8c.html#a076fe6125da4d6037b8bc4d912df4015">densityMatrixBlockFitsInChunk</a>(qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, </div>
<div class="line"><a name="l00779"></a><span class="lineno"> 779</span>  qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>, biggerQubit);</div>
<div class="line"><a name="l00780"></a><span class="lineno"> 780</span>  <span class="keywordflow">if</span> (useLocalDataOnlyBigQubit){</div>
<div class="line"><a name="l00781"></a><span class="lineno"> 781</span>  <span class="comment">// does parts 1, 2 and 3 locally in one go</span></div>
<div class="line"><a name="l00782"></a><span class="lineno"> 782</span>  <a class="code" href="QuEST__cpu_8c.html#a3510f01d4d15dcc545564eb84c668cad">densmatr_mixTwoQubitDepolarisingLocal</a>(qureg, qubit1, qubit2, delta, gamma);</div>
<div class="line"><a name="l00783"></a><span class="lineno"> 783</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00784"></a><span class="lineno"> 784</span>  useLocalDataOnlySmallQubit = <a class="code" href="QuEST__cpu__distributed_8c.html#a076fe6125da4d6037b8bc4d912df4015">densityMatrixBlockFitsInChunk</a>(qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, </div>
<div class="line"><a name="l00785"></a><span class="lineno"> 785</span>  qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>, smallerQubit);</div>
<div class="line"><a name="l00786"></a><span class="lineno"> 786</span>  <span class="keywordflow">if</span> (useLocalDataOnlySmallQubit){</div>
<div class="line"><a name="l00787"></a><span class="lineno"> 787</span>  <span class="comment">// do part 1 locally</span></div>
<div class="line"><a name="l00788"></a><span class="lineno"> 788</span>  <a class="code" href="QuEST__cpu_8c.html#ae90f82418e0aa67218d733dbbc681998">densmatr_mixTwoQubitDepolarisingLocalPart1</a>(qureg, smallerQubit, biggerQubit, delta);</div>
<div class="line"><a name="l00789"></a><span class="lineno"> 789</span>  </div>
<div class="line"><a name="l00790"></a><span class="lineno"> 790</span>  <span class="comment">// do parts 2 and 3 distributed (if part 2 is distributed part 3 is also distributed)</span></div>
<div class="line"><a name="l00791"></a><span class="lineno"> 791</span>  <span class="comment">// part 2 will be distributed and the value of the small qubit won't matter</span></div>
<div class="line"><a name="l00792"></a><span class="lineno"> 792</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a373394db1bf71b0be63585c0e9a52abb">compressPairVectorForTwoQubitDepolarise</a>(qureg, smallerQubit, biggerQubit);</div>
<div class="line"><a name="l00793"></a><span class="lineno"> 793</span>  rankIsUpperBiggerQubit = <a class="code" href="QuEST__cpu__distributed_8c.html#aa3c2d644a2be7f0d3aa9f757527d306f">chunkIsUpperInOuterBlock</a>(qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, biggerQubit, </div>
<div class="line"><a name="l00794"></a><span class="lineno"> 794</span>  qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00795"></a><span class="lineno"> 795</span>  pairRank = <a class="code" href="QuEST__cpu__distributed_8c.html#ae66dc6569c6e4008c33d6739db422c08">getChunkOuterBlockPairId</a>(rankIsUpperBiggerQubit, qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, </div>
<div class="line"><a name="l00796"></a><span class="lineno"> 796</span>  biggerQubit, qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00797"></a><span class="lineno"> 797</span>  </div>
<div class="line"><a name="l00798"></a><span class="lineno"> 798</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a37dae401754961c9100b3c0907913c3e">exchangePairStateVectorHalves</a>(qureg, pairRank);</div>
<div class="line"><a name="l00799"></a><span class="lineno"> 799</span>  <a class="code" href="QuEST__cpu_8c.html#a2f76ec8f08e19bb8e1254aafb10e160e">densmatr_mixTwoQubitDepolarisingDistributed</a>(qureg, smallerQubit, biggerQubit, delta, GAMMA_PARTS_1_OR_2);</div>
<div class="line"><a name="l00800"></a><span class="lineno"> 800</span>  </div>
<div class="line"><a name="l00801"></a><span class="lineno"> 801</span>  <span class="comment">// part 3 will be distributed but involve rearranging for the smaller qubit</span></div>
<div class="line"><a name="l00802"></a><span class="lineno"> 802</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a373394db1bf71b0be63585c0e9a52abb">compressPairVectorForTwoQubitDepolarise</a>(qureg, smallerQubit, biggerQubit);</div>
<div class="line"><a name="l00803"></a><span class="lineno"> 803</span>  rankIsUpperBiggerQubit = <a class="code" href="QuEST__cpu__distributed_8c.html#aa3c2d644a2be7f0d3aa9f757527d306f">chunkIsUpperInOuterBlock</a>(qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, biggerQubit, </div>
<div class="line"><a name="l00804"></a><span class="lineno"> 804</span>  qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00805"></a><span class="lineno"> 805</span>  pairRank = <a class="code" href="QuEST__cpu__distributed_8c.html#ae66dc6569c6e4008c33d6739db422c08">getChunkOuterBlockPairId</a>(rankIsUpperBiggerQubit, qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, </div>
<div class="line"><a name="l00806"></a><span class="lineno"> 806</span>  biggerQubit, qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00807"></a><span class="lineno"> 807</span>  </div>
<div class="line"><a name="l00808"></a><span class="lineno"> 808</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a37dae401754961c9100b3c0907913c3e">exchangePairStateVectorHalves</a>(qureg, pairRank);</div>
<div class="line"><a name="l00809"></a><span class="lineno"> 809</span>  <a class="code" href="QuEST__cpu_8c.html#acabdfbd3184d3ab3bded61e24142b800">densmatr_mixTwoQubitDepolarisingQ1LocalQ2DistributedPart3</a>(qureg, smallerQubit, biggerQubit, delta, gamma);</div>
<div class="line"><a name="l00810"></a><span class="lineno"> 810</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00811"></a><span class="lineno"> 811</span>  <span class="comment">// do part 1, 2 and 3 distributed</span></div>
<div class="line"><a name="l00812"></a><span class="lineno"> 812</span>  <span class="comment">// part 1</span></div>
<div class="line"><a name="l00813"></a><span class="lineno"> 813</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a373394db1bf71b0be63585c0e9a52abb">compressPairVectorForTwoQubitDepolarise</a>(qureg, smallerQubit, biggerQubit);</div>
<div class="line"><a name="l00814"></a><span class="lineno"> 814</span>  rankIsUpperSmallerQubit = <a class="code" href="QuEST__cpu__distributed_8c.html#aa3c2d644a2be7f0d3aa9f757527d306f">chunkIsUpperInOuterBlock</a>(qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, smallerQubit, </div>
<div class="line"><a name="l00815"></a><span class="lineno"> 815</span>  qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00816"></a><span class="lineno"> 816</span>  pairRank = <a class="code" href="QuEST__cpu__distributed_8c.html#ae66dc6569c6e4008c33d6739db422c08">getChunkOuterBlockPairId</a>(rankIsUpperSmallerQubit, qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, </div>
<div class="line"><a name="l00817"></a><span class="lineno"> 817</span>  smallerQubit, qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00818"></a><span class="lineno"> 818</span>  </div>
<div class="line"><a name="l00819"></a><span class="lineno"> 819</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a37dae401754961c9100b3c0907913c3e">exchangePairStateVectorHalves</a>(qureg, pairRank);</div>
<div class="line"><a name="l00820"></a><span class="lineno"> 820</span>  <a class="code" href="QuEST__cpu_8c.html#a2f76ec8f08e19bb8e1254aafb10e160e">densmatr_mixTwoQubitDepolarisingDistributed</a>(qureg, smallerQubit, biggerQubit, delta, GAMMA_PARTS_1_OR_2);</div>
<div class="line"><a name="l00821"></a><span class="lineno"> 821</span>  </div>
<div class="line"><a name="l00822"></a><span class="lineno"> 822</span>  <span class="comment">// part 2</span></div>
<div class="line"><a name="l00823"></a><span class="lineno"> 823</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a373394db1bf71b0be63585c0e9a52abb">compressPairVectorForTwoQubitDepolarise</a>(qureg, smallerQubit, biggerQubit);</div>
<div class="line"><a name="l00824"></a><span class="lineno"> 824</span>  rankIsUpperBiggerQubit = <a class="code" href="QuEST__cpu__distributed_8c.html#aa3c2d644a2be7f0d3aa9f757527d306f">chunkIsUpperInOuterBlock</a>(qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, biggerQubit, </div>
<div class="line"><a name="l00825"></a><span class="lineno"> 825</span>  qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00826"></a><span class="lineno"> 826</span>  pairRank = <a class="code" href="QuEST__cpu__distributed_8c.html#ae66dc6569c6e4008c33d6739db422c08">getChunkOuterBlockPairId</a>(rankIsUpperBiggerQubit, qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, </div>
<div class="line"><a name="l00827"></a><span class="lineno"> 827</span>  biggerQubit, qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00828"></a><span class="lineno"> 828</span>  </div>
<div class="line"><a name="l00829"></a><span class="lineno"> 829</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a37dae401754961c9100b3c0907913c3e">exchangePairStateVectorHalves</a>(qureg, pairRank);</div>
<div class="line"><a name="l00830"></a><span class="lineno"> 830</span>  <a class="code" href="QuEST__cpu_8c.html#a2f76ec8f08e19bb8e1254aafb10e160e">densmatr_mixTwoQubitDepolarisingDistributed</a>(qureg, smallerQubit, biggerQubit, delta, GAMMA_PARTS_1_OR_2);</div>
<div class="line"><a name="l00831"></a><span class="lineno"> 831</span>  </div>
<div class="line"><a name="l00832"></a><span class="lineno"> 832</span>  <span class="comment">// part 3</span></div>
<div class="line"><a name="l00833"></a><span class="lineno"> 833</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a373394db1bf71b0be63585c0e9a52abb">compressPairVectorForTwoQubitDepolarise</a>(qureg, smallerQubit, biggerQubit);</div>
<div class="line"><a name="l00834"></a><span class="lineno"> 834</span>  pairRank = <a class="code" href="QuEST__cpu__distributed_8c.html#ab1ec7f241b68b079c8e316d190af49ce">getChunkOuterBlockPairIdForPart3</a>(rankIsUpperSmallerQubit, rankIsUpperBiggerQubit, </div>
<div class="line"><a name="l00835"></a><span class="lineno"> 835</span>  qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, smallerQubit, biggerQubit, qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00836"></a><span class="lineno"> 836</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a37dae401754961c9100b3c0907913c3e">exchangePairStateVectorHalves</a>(qureg, pairRank);</div>
<div class="line"><a name="l00837"></a><span class="lineno"> 837</span>  <a class="code" href="QuEST__cpu_8c.html#a2f76ec8f08e19bb8e1254aafb10e160e">densmatr_mixTwoQubitDepolarisingDistributed</a>(qureg, smallerQubit, biggerQubit, delta, gamma);</div>
<div class="line"><a name="l00838"></a><span class="lineno"> 838</span>  </div>
<div class="line"><a name="l00839"></a><span class="lineno"> 839</span>  }</div>
<div class="line"><a name="l00840"></a><span class="lineno"> 840</span>  }</div>
<div class="line"><a name="l00841"></a><span class="lineno"> 841</span>  </div>
<div class="line"><a name="l00842"></a><span class="lineno"> 842</span> }</div>
<div class="line"><a name="l00843"></a><span class="lineno"> 843</span>  </div>
<div class="line"><a name="l00844"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#aec63559e8b9ab0e17efe18d64d2ceca6"> 844</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu__distributed_8c.html#aec63559e8b9ab0e17efe18d64d2ceca6">statevec_compactUnitary</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> targetQubit, <a class="code" href="structComplex.html">Complex</a> alpha, <a class="code" href="structComplex.html">Complex</a> beta)</div>
<div class="line"><a name="l00845"></a><span class="lineno"> 845</span> {</div>
<div class="line"><a name="l00846"></a><span class="lineno"> 846</span>  <span class="comment">// flag to require memory exchange. 1: an entire block fits on one rank, 0: at most half a block fits on one rank</span></div>
<div class="line"><a name="l00847"></a><span class="lineno"> 847</span>  <span class="keywordtype">int</span> useLocalDataOnly = <a class="code" href="QuEST__cpu__distributed_8c.html#a4d043bb0cee54a5f94faf3ffc34a6790">halfMatrixBlockFitsInChunk</a>(qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, targetQubit);</div>
<div class="line"><a name="l00848"></a><span class="lineno"> 848</span>  <a class="code" href="structComplex.html">Complex</a> rot1, rot2;</div>
<div class="line"><a name="l00849"></a><span class="lineno"> 849</span>  </div>
<div class="line"><a name="l00850"></a><span class="lineno"> 850</span>  <span class="comment">// rank's chunk is in upper half of block </span></div>
<div class="line"><a name="l00851"></a><span class="lineno"> 851</span>  <span class="keywordtype">int</span> rankIsUpper;</div>
<div class="line"><a name="l00852"></a><span class="lineno"> 852</span>  <span class="keywordtype">int</span> pairRank; <span class="comment">// rank of corresponding chunk</span></div>
<div class="line"><a name="l00853"></a><span class="lineno"> 853</span>  </div>
<div class="line"><a name="l00854"></a><span class="lineno"> 854</span>  <span class="keywordflow">if</span> (useLocalDataOnly){</div>
<div class="line"><a name="l00855"></a><span class="lineno"> 855</span>  <span class="comment">// all values required to update state vector lie in this rank</span></div>
<div class="line"><a name="l00856"></a><span class="lineno"> 856</span>  <a class="code" href="QuEST__cpu_8c.html#a5ddfdb22e4704b680d67d08d9e80835b">statevec_compactUnitaryLocal</a>(qureg, targetQubit, alpha, beta);</div>
<div class="line"><a name="l00857"></a><span class="lineno"> 857</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00858"></a><span class="lineno"> 858</span>  <span class="comment">// need to get corresponding chunk of state vector from other rank</span></div>
<div class="line"><a name="l00859"></a><span class="lineno"> 859</span>  rankIsUpper = <a class="code" href="QuEST__cpu__distributed_8c.html#a0552889d6f57d9e0ed8b209bf426482d">chunkIsUpper</a>(qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, targetQubit);</div>
<div class="line"><a name="l00860"></a><span class="lineno"> 860</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#adb4b0373425b282abed27742d0ce0872">getRotAngle</a>(rankIsUpper, &rot1, &rot2, alpha, beta);</div>
<div class="line"><a name="l00861"></a><span class="lineno"> 861</span>  pairRank = <a class="code" href="QuEST__cpu__distributed_8c.html#a7dba097f23f5d48dfdc9f3250444e2e4">getChunkPairId</a>(rankIsUpper, qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, targetQubit);</div>
<div class="line"><a name="l00862"></a><span class="lineno"> 862</span>  <span class="comment">// get corresponding values from my pair</span></div>
<div class="line"><a name="l00863"></a><span class="lineno"> 863</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#ae01c3eb75fd32de1a7e1dbc7a33a21e3">exchangeStateVectors</a>(qureg, pairRank);</div>
<div class="line"><a name="l00864"></a><span class="lineno"> 864</span>  </div>
<div class="line"><a name="l00865"></a><span class="lineno"> 865</span>  <span class="comment">// this rank's values are either in the upper of lower half of the block. </span></div>
<div class="line"><a name="l00866"></a><span class="lineno"> 866</span>  <span class="comment">// send values to compactUnitaryDistributed in the correct order</span></div>
<div class="line"><a name="l00867"></a><span class="lineno"> 867</span>  <span class="keywordflow">if</span> (rankIsUpper){</div>
<div class="line"><a name="l00868"></a><span class="lineno"> 868</span>  <a class="code" href="QuEST__cpu_8c.html#a0a7a35628b1c1eb47336deb9afda5b68">statevec_compactUnitaryDistributed</a>(qureg,rot1,rot2,</div>
<div class="line"><a name="l00869"></a><span class="lineno"> 869</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>, <span class="comment">//upper</span></div>
<div class="line"><a name="l00870"></a><span class="lineno"> 870</span>  qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>, <span class="comment">//lower</span></div>
<div class="line"><a name="l00871"></a><span class="lineno"> 871</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>); <span class="comment">//output</span></div>
<div class="line"><a name="l00872"></a><span class="lineno"> 872</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00873"></a><span class="lineno"> 873</span>  <a class="code" href="QuEST__cpu_8c.html#a0a7a35628b1c1eb47336deb9afda5b68">statevec_compactUnitaryDistributed</a>(qureg,rot1,rot2,</div>
<div class="line"><a name="l00874"></a><span class="lineno"> 874</span>  qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>, <span class="comment">//upper</span></div>
<div class="line"><a name="l00875"></a><span class="lineno"> 875</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>, <span class="comment">//lower</span></div>
<div class="line"><a name="l00876"></a><span class="lineno"> 876</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>); <span class="comment">//output</span></div>
<div class="line"><a name="l00877"></a><span class="lineno"> 877</span>  }</div>
<div class="line"><a name="l00878"></a><span class="lineno"> 878</span>  }</div>
<div class="line"><a name="l00879"></a><span class="lineno"> 879</span> }</div>
<div class="line"><a name="l00880"></a><span class="lineno"> 880</span>  </div>
<div class="line"><a name="l00881"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#ac3735bd959600e57b2ee3a105666cddf"> 881</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu__distributed_8c.html#ac3735bd959600e57b2ee3a105666cddf">statevec_unitary</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> targetQubit, <a class="code" href="structComplexMatrix2.html">ComplexMatrix2</a> u)</div>
<div class="line"><a name="l00882"></a><span class="lineno"> 882</span> {</div>
<div class="line"><a name="l00883"></a><span class="lineno"> 883</span>  <span class="comment">// flag to require memory exchange. 1: an entire block fits on one rank, 0: at most half a block fits on one rank</span></div>
<div class="line"><a name="l00884"></a><span class="lineno"> 884</span>  <span class="keywordtype">int</span> useLocalDataOnly = <a class="code" href="QuEST__cpu__distributed_8c.html#a4d043bb0cee54a5f94faf3ffc34a6790">halfMatrixBlockFitsInChunk</a>(qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, targetQubit);</div>
<div class="line"><a name="l00885"></a><span class="lineno"> 885</span>  <a class="code" href="structComplex.html">Complex</a> rot1, rot2;</div>
<div class="line"><a name="l00886"></a><span class="lineno"> 886</span>  </div>
<div class="line"><a name="l00887"></a><span class="lineno"> 887</span>  <span class="comment">// rank's chunk is in upper half of block </span></div>
<div class="line"><a name="l00888"></a><span class="lineno"> 888</span>  <span class="keywordtype">int</span> rankIsUpper;</div>
<div class="line"><a name="l00889"></a><span class="lineno"> 889</span>  <span class="keywordtype">int</span> pairRank; <span class="comment">// rank of corresponding chunk</span></div>
<div class="line"><a name="l00890"></a><span class="lineno"> 890</span>  </div>
<div class="line"><a name="l00891"></a><span class="lineno"> 891</span>  <span class="keywordflow">if</span> (useLocalDataOnly){</div>
<div class="line"><a name="l00892"></a><span class="lineno"> 892</span>  <span class="comment">// all values required to update state vector lie in this rank</span></div>
<div class="line"><a name="l00893"></a><span class="lineno"> 893</span>  <a class="code" href="QuEST__cpu_8c.html#aafc398f8f479fcc066a2dea700235635">statevec_unitaryLocal</a>(qureg, targetQubit, u);</div>
<div class="line"><a name="l00894"></a><span class="lineno"> 894</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00895"></a><span class="lineno"> 895</span>  <span class="comment">// need to get corresponding chunk of state vector from other rank</span></div>
<div class="line"><a name="l00896"></a><span class="lineno"> 896</span>  rankIsUpper = <a class="code" href="QuEST__cpu__distributed_8c.html#a0552889d6f57d9e0ed8b209bf426482d">chunkIsUpper</a>(qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, targetQubit);</div>
<div class="line"><a name="l00897"></a><span class="lineno"> 897</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a5c9b2f129bdffaaba9857f6eddecbb17">getRotAngleFromUnitaryMatrix</a>(rankIsUpper, &rot1, &rot2, u);</div>
<div class="line"><a name="l00898"></a><span class="lineno"> 898</span>  pairRank = <a class="code" href="QuEST__cpu__distributed_8c.html#a7dba097f23f5d48dfdc9f3250444e2e4">getChunkPairId</a>(rankIsUpper, qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, targetQubit);</div>
<div class="line"><a name="l00899"></a><span class="lineno"> 899</span>  <span class="comment">// get corresponding values from my pair</span></div>
<div class="line"><a name="l00900"></a><span class="lineno"> 900</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#ae01c3eb75fd32de1a7e1dbc7a33a21e3">exchangeStateVectors</a>(qureg, pairRank);</div>
<div class="line"><a name="l00901"></a><span class="lineno"> 901</span>  </div>
<div class="line"><a name="l00902"></a><span class="lineno"> 902</span>  <span class="comment">// this rank's values are either in the upper of lower half of the block. </span></div>
<div class="line"><a name="l00903"></a><span class="lineno"> 903</span>  <span class="comment">// send values to compactUnitaryDistributed in the correct order</span></div>
<div class="line"><a name="l00904"></a><span class="lineno"> 904</span>  <span class="keywordflow">if</span> (rankIsUpper){</div>
<div class="line"><a name="l00905"></a><span class="lineno"> 905</span>  <a class="code" href="QuEST__cpu_8c.html#a0ce2c2fd54df25495e99dc5b95bed4b2">statevec_unitaryDistributed</a>(qureg,rot1,rot2,</div>
<div class="line"><a name="l00906"></a><span class="lineno"> 906</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>, <span class="comment">//upper</span></div>
<div class="line"><a name="l00907"></a><span class="lineno"> 907</span>  qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>, <span class="comment">//lower</span></div>
<div class="line"><a name="l00908"></a><span class="lineno"> 908</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>); <span class="comment">//output</span></div>
<div class="line"><a name="l00909"></a><span class="lineno"> 909</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00910"></a><span class="lineno"> 910</span>  <a class="code" href="QuEST__cpu_8c.html#a0ce2c2fd54df25495e99dc5b95bed4b2">statevec_unitaryDistributed</a>(qureg,rot1,rot2,</div>
<div class="line"><a name="l00911"></a><span class="lineno"> 911</span>  qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>, <span class="comment">//upper</span></div>
<div class="line"><a name="l00912"></a><span class="lineno"> 912</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>, <span class="comment">//lower</span></div>
<div class="line"><a name="l00913"></a><span class="lineno"> 913</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>); <span class="comment">//output</span></div>
<div class="line"><a name="l00914"></a><span class="lineno"> 914</span>  }</div>
<div class="line"><a name="l00915"></a><span class="lineno"> 915</span>  }</div>
<div class="line"><a name="l00916"></a><span class="lineno"> 916</span>  </div>
<div class="line"><a name="l00917"></a><span class="lineno"> 917</span>  </div>
<div class="line"><a name="l00918"></a><span class="lineno"> 918</span> }</div>
<div class="line"><a name="l00919"></a><span class="lineno"> 919</span>  </div>
<div class="line"><a name="l00920"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#a1275d604674224d87a173fb5bac78835"> 920</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a1275d604674224d87a173fb5bac78835">statevec_controlledCompactUnitary</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> controlQubit, <span class="keywordtype">int</span> targetQubit, <a class="code" href="structComplex.html">Complex</a> alpha, <a class="code" href="structComplex.html">Complex</a> beta)</div>
<div class="line"><a name="l00921"></a><span class="lineno"> 921</span> {</div>
<div class="line"><a name="l00922"></a><span class="lineno"> 922</span>  <span class="comment">// flag to require memory exchange. 1: an entire block fits on one rank, 0: at most half a block fits on one rank</span></div>
<div class="line"><a name="l00923"></a><span class="lineno"> 923</span>  <span class="keywordtype">int</span> useLocalDataOnly = <a class="code" href="QuEST__cpu__distributed_8c.html#a4d043bb0cee54a5f94faf3ffc34a6790">halfMatrixBlockFitsInChunk</a>(qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, targetQubit);</div>
<div class="line"><a name="l00924"></a><span class="lineno"> 924</span>  <a class="code" href="structComplex.html">Complex</a> rot1, rot2;</div>
<div class="line"><a name="l00925"></a><span class="lineno"> 925</span>  </div>
<div class="line"><a name="l00926"></a><span class="lineno"> 926</span>  <span class="comment">// rank's chunk is in upper half of block </span></div>
<div class="line"><a name="l00927"></a><span class="lineno"> 927</span>  <span class="keywordtype">int</span> rankIsUpper;</div>
<div class="line"><a name="l00928"></a><span class="lineno"> 928</span>  <span class="keywordtype">int</span> pairRank; <span class="comment">// rank of corresponding chunk</span></div>
<div class="line"><a name="l00929"></a><span class="lineno"> 929</span>  </div>
<div class="line"><a name="l00930"></a><span class="lineno"> 930</span>  <span class="keywordflow">if</span> (useLocalDataOnly){</div>
<div class="line"><a name="l00931"></a><span class="lineno"> 931</span>  <span class="comment">// all values required to update state vector lie in this rank</span></div>
<div class="line"><a name="l00932"></a><span class="lineno"> 932</span>  <a class="code" href="QuEST__cpu_8c.html#a215e2d6f88dbecc0b408b3573b5e144f">statevec_controlledCompactUnitaryLocal</a>(qureg, controlQubit, targetQubit, alpha, beta);</div>
<div class="line"><a name="l00933"></a><span class="lineno"> 933</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00934"></a><span class="lineno"> 934</span>  <span class="comment">// need to get corresponding chunk of state vector from other rank</span></div>
<div class="line"><a name="l00935"></a><span class="lineno"> 935</span>  rankIsUpper = <a class="code" href="QuEST__cpu__distributed_8c.html#a0552889d6f57d9e0ed8b209bf426482d">chunkIsUpper</a>(qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, targetQubit);</div>
<div class="line"><a name="l00936"></a><span class="lineno"> 936</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#adb4b0373425b282abed27742d0ce0872">getRotAngle</a>(rankIsUpper, &rot1, &rot2, alpha, beta);</div>
<div class="line"><a name="l00937"></a><span class="lineno"> 937</span>  pairRank = <a class="code" href="QuEST__cpu__distributed_8c.html#a7dba097f23f5d48dfdc9f3250444e2e4">getChunkPairId</a>(rankIsUpper, qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, targetQubit);</div>
<div class="line"><a name="l00938"></a><span class="lineno"> 938</span>  <span class="comment">//printf("%d rank has pair rank: %d\n", qureg.rank, pairRank);</span></div>
<div class="line"><a name="l00939"></a><span class="lineno"> 939</span>  <span class="comment">// get corresponding values from my pair</span></div>
<div class="line"><a name="l00940"></a><span class="lineno"> 940</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#ae01c3eb75fd32de1a7e1dbc7a33a21e3">exchangeStateVectors</a>(qureg, pairRank);</div>
<div class="line"><a name="l00941"></a><span class="lineno"> 941</span>  </div>
<div class="line"><a name="l00942"></a><span class="lineno"> 942</span>  <span class="comment">// this rank's values are either in the upper of lower half of the block. send values to controlledCompactUnitaryDistributed</span></div>
<div class="line"><a name="l00943"></a><span class="lineno"> 943</span>  <span class="comment">// in the correct order</span></div>
<div class="line"><a name="l00944"></a><span class="lineno"> 944</span>  <span class="keywordflow">if</span> (rankIsUpper){</div>
<div class="line"><a name="l00945"></a><span class="lineno"> 945</span>  <a class="code" href="QuEST__cpu_8c.html#a071baf8b6951d2a7d6529394b6f39364">statevec_controlledCompactUnitaryDistributed</a>(qureg,controlQubit,rot1,rot2,</div>
<div class="line"><a name="l00946"></a><span class="lineno"> 946</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>, <span class="comment">//upper</span></div>
<div class="line"><a name="l00947"></a><span class="lineno"> 947</span>  qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>, <span class="comment">//lower</span></div>
<div class="line"><a name="l00948"></a><span class="lineno"> 948</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>); <span class="comment">//output</span></div>
<div class="line"><a name="l00949"></a><span class="lineno"> 949</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00950"></a><span class="lineno"> 950</span>  <a class="code" href="QuEST__cpu_8c.html#a071baf8b6951d2a7d6529394b6f39364">statevec_controlledCompactUnitaryDistributed</a>(qureg,controlQubit,rot1,rot2,</div>
<div class="line"><a name="l00951"></a><span class="lineno"> 951</span>  qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>, <span class="comment">//upper</span></div>
<div class="line"><a name="l00952"></a><span class="lineno"> 952</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>, <span class="comment">//lower</span></div>
<div class="line"><a name="l00953"></a><span class="lineno"> 953</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>); <span class="comment">//output</span></div>
<div class="line"><a name="l00954"></a><span class="lineno"> 954</span>  }</div>
<div class="line"><a name="l00955"></a><span class="lineno"> 955</span>  }</div>
<div class="line"><a name="l00956"></a><span class="lineno"> 956</span> }</div>
<div class="line"><a name="l00957"></a><span class="lineno"> 957</span>  </div>
<div class="line"><a name="l00958"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#add9ca9956cdd81ed5d0b0f66168c04a3"> 958</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu__distributed_8c.html#add9ca9956cdd81ed5d0b0f66168c04a3">statevec_controlledUnitary</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> controlQubit, <span class="keywordtype">int</span> targetQubit, </div>
<div class="line"><a name="l00959"></a><span class="lineno"> 959</span>  <a class="code" href="structComplexMatrix2.html">ComplexMatrix2</a> u)</div>
<div class="line"><a name="l00960"></a><span class="lineno"> 960</span> {</div>
<div class="line"><a name="l00961"></a><span class="lineno"> 961</span>  <span class="comment">// flag to require memory exchange. 1: an entire block fits on one rank, 0: at most half a block fits on one rank</span></div>
<div class="line"><a name="l00962"></a><span class="lineno"> 962</span>  <span class="keywordtype">int</span> useLocalDataOnly = <a class="code" href="QuEST__cpu__distributed_8c.html#a4d043bb0cee54a5f94faf3ffc34a6790">halfMatrixBlockFitsInChunk</a>(qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, targetQubit);</div>
<div class="line"><a name="l00963"></a><span class="lineno"> 963</span>  <a class="code" href="structComplex.html">Complex</a> rot1, rot2;</div>
<div class="line"><a name="l00964"></a><span class="lineno"> 964</span>  </div>
<div class="line"><a name="l00965"></a><span class="lineno"> 965</span>  <span class="comment">// rank's chunk is in upper half of block </span></div>
<div class="line"><a name="l00966"></a><span class="lineno"> 966</span>  <span class="keywordtype">int</span> rankIsUpper;</div>
<div class="line"><a name="l00967"></a><span class="lineno"> 967</span>  <span class="keywordtype">int</span> pairRank; <span class="comment">// rank of corresponding chunk</span></div>
<div class="line"><a name="l00968"></a><span class="lineno"> 968</span>  </div>
<div class="line"><a name="l00969"></a><span class="lineno"> 969</span>  <span class="keywordflow">if</span> (useLocalDataOnly){</div>
<div class="line"><a name="l00970"></a><span class="lineno"> 970</span>  <span class="comment">// all values required to update state vector lie in this rank</span></div>
<div class="line"><a name="l00971"></a><span class="lineno"> 971</span>  <a class="code" href="QuEST__cpu_8c.html#a903beb4f5d8753a964ce2dc5f9096a24">statevec_controlledUnitaryLocal</a>(qureg, controlQubit, targetQubit, u);</div>
<div class="line"><a name="l00972"></a><span class="lineno"> 972</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00973"></a><span class="lineno"> 973</span>  <span class="comment">// need to get corresponding chunk of state vector from other rank</span></div>
<div class="line"><a name="l00974"></a><span class="lineno"> 974</span>  rankIsUpper = <a class="code" href="QuEST__cpu__distributed_8c.html#a0552889d6f57d9e0ed8b209bf426482d">chunkIsUpper</a>(qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, targetQubit);</div>
<div class="line"><a name="l00975"></a><span class="lineno"> 975</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#a5c9b2f129bdffaaba9857f6eddecbb17">getRotAngleFromUnitaryMatrix</a>(rankIsUpper, &rot1, &rot2, u);</div>
<div class="line"><a name="l00976"></a><span class="lineno"> 976</span>  pairRank = <a class="code" href="QuEST__cpu__distributed_8c.html#a7dba097f23f5d48dfdc9f3250444e2e4">getChunkPairId</a>(rankIsUpper, qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, targetQubit);</div>
<div class="line"><a name="l00977"></a><span class="lineno"> 977</span>  <span class="comment">//printf("%d rank has pair rank: %d\n", qureg.rank, pairRank);</span></div>
<div class="line"><a name="l00978"></a><span class="lineno"> 978</span>  <span class="comment">// get corresponding values from my pair</span></div>
<div class="line"><a name="l00979"></a><span class="lineno"> 979</span>  <a class="code" href="QuEST__cpu__distributed_8c.html#ae01c3eb75fd32de1a7e1dbc7a33a21e3">exchangeStateVectors</a>(qureg, pairRank);</div>
<div class="line"><a name="l00980"></a><span class="lineno"> 980</span>  </div>
<div class="line"><a name="l00981"></a><span class="lineno"> 981</span>  <span class="comment">// this rank's values are either in the upper of lower half of the block. send values to controlledUnitaryDistributed</span></div>
<div class="line"><a name="l00982"></a><span class="lineno"> 982</span>  <span class="comment">// in the correct order</span></div>
<div class="line"><a name="l00983"></a><span class="lineno"> 983</span>  <span class="keywordflow">if</span> (rankIsUpper){</div>
<div class="line"><a name="l00984"></a><span class="lineno"> 984</span>  <a class="code" href="QuEST__cpu_8c.html#a57368529b2a7e76fec423cbfe9980b22">statevec_controlledUnitaryDistributed</a>(qureg,controlQubit,rot1,rot2,</div>
<div class="line"><a name="l00985"></a><span class="lineno"> 985</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>, <span class="comment">//upper</span></div>
<div class="line"><a name="l00986"></a><span class="lineno"> 986</span>  qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>, <span class="comment">//lower</span></div>
<div class="line"><a name="l00987"></a><span class="lineno"> 987</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>); <span class="comment">//output</span></div>
<div class="line"><a name="l00988"></a><span class="lineno"> 988</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00989"></a><span class="lineno"> 989</span>  <a class="code" href="QuEST__cpu_8c.html#a57368529b2a7e76fec423cbfe9980b22">statevec_controlledUnitaryDistributed</a>(qureg,controlQubit,rot1,rot2,</div>
<div class="line"><a name="l00990"></a><span class="lineno"> 990</span>  qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>, <span class="comment">//upper</span></div>
<div class="line"><a name="l00991"></a><span class="lineno"> 991</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>, <span class="comment">//lower</span></div>
<div class="line"><a name="l00992"></a><span class="lineno"> 992</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>); <span class="comment">//output</span></div>
<div class="line"><a name="l00993"></a><span class="lineno"> 993</span>  }</div>
<div class="line"><a name="l00994"></a><span class="lineno"> 994</span>  }</div>
<div class="line"><a name="l00995"></a><span class="lineno"> 995</span> }</div>
<div class="line"><a name="l00996"></a><span class="lineno"> 996</span>  </div>
<div class="line"><a name="l00997"></a><span class="lineno"><a class="line" href="QuEST__cpu__distributed_8c.html#a600bda10463e2078ce746ec28f2d39c9"> 997</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu__distributed_8c.html#a600bda10463e2078ce746ec28f2d39c9">statevec_multiControlledUnitary</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> ctrlQubitsMask, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> ctrlFlipMask, <span class="keywordtype">int</span> targetQubit, <a class="code" href="structComplexMatrix2.html">ComplexMatrix2</a> u)</div>
<div class="line"><a name="l00998"></a><span class="lineno"> 998</span> {</div>
<div class="line"><a name="l00999"></a><span class="lineno"> 999</span>  <span class="comment">// flag to require memory exchange. 1: an entire block fits on one rank, 0: at most half a block fits on one rank</span></div>
<div class="line"><a name="l01000"></a><span class="lineno"> 1000</span>  <span class="keywordtype">int</span> useLocalDataOnly = <a class="code" href="QuEST__cpu__distributed_8c.html#a4d043bb0cee54a5f94faf3ffc34a6790">halfMatrixBlockFitsInChunk</a>(qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, targetQubit);</div>
<div class="line"><a name="l01001"></a><span class="lineno"> 1001</span>  <a class="code" href="structComplex.html">Complex</a> rot1, rot2;</div>
<div class="line"><a name="l01002"></a><span class="lineno"> 1002</span>  </div>
<div class="line"><a name="l01003"></a><span class="lineno"> 1003</span>  <span class="comment">// rank's chunk is in upper half of block </span></div>
<div class="line"><a name="l01004"></a><span class="lineno"> 1004</span>  <span class="keywordtype">int</span> rankIsUpper;</div>
<div class="line"><a name="l01005"></a><span class="lineno"> 1005</span>  <span class="keywordtype">int</span> pairRank; <span class="comment">// rank of corresponding chunk</span></div>