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<div class="title">test_gates.cpp</div> </div>
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<a href="test__gates_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>  </div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor">#include "catch.hpp"</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="preprocessor">#include "<a class="code" href="QuEST_8h.html">QuEST.h</a>"</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="preprocessor">#include "<a class="code" href="utilities_8hpp.html">utilities.hpp</a>"</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>  </div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">/* allows concise use of Contains in catch's REQUIRE_THROWS_WITH */</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="keyword">using</span> Catch::Matchers::Contains;</div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>  </div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>  </div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  </div>
<div class="line"><a name="l00015"></a><span class="lineno"><a class="line" href="group__unittest.html#ga0168f7b5f09ccbb226144053ad1b7497"> 15</a></span> <a class="code" href="group__unittest.html#ga0168f7b5f09ccbb226144053ad1b7497">TEST_CASE</a>( <span class="stringliteral">"collapseToOutcome"</span>, <span class="stringliteral">"[gates]"</span> ) {</div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  </div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  <a class="code" href="structQureg.html">Qureg</a> vec = <a class="code" href="group__type.html#ga3392816c0643414165c2f5caeec17df0">createQureg</a>(<a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a>, <a class="code" href="main_8cpp.html#a718130cc1fc36cde991aff3d4c85c47d">QUEST_ENV</a>);</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  <a class="code" href="structQureg.html">Qureg</a> mat = <a class="code" href="group__type.html#ga93e55b6650b408abb30a1d4a8bce757c">createDensityQureg</a>(<a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a>, <a class="code" href="main_8cpp.html#a718130cc1fc36cde991aff3d4c85c47d">QUEST_ENV</a>);</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  SECTION( <span class="stringliteral">"correctness"</span> ) {</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  </div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keywordtype">int</span> qubit = GENERATE( range(0,<a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a>) );</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keywordtype">int</span> outcome = GENERATE( 0, 1 );</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  </div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="comment">// repeat these random tests 10 times on every qubit, and for both outcomes</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  GENERATE( range(0,10) );</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  </div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  SECTION( <span class="stringliteral">"state-vector"</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="comment">// use a random L2 state for every qubit & outcome</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <a class="code" href="group__testutilities.html#gac9263a65c96a458b810b20baa81c5b94">QVector</a> vecRef = <a class="code" href="group__testutilities.html#gae1d2eb70b50267f8186cbd53e300d94f">getRandomStateVector</a>(<a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a>);</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <a class="code" href="group__testutilities.html#gaf5a18d4c00dfe0523972be3bfc666362">toQureg</a>(vec, vecRef);</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>  <span class="comment">// calculate prob of outcome</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> prob = 0;</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> ind=0; ind<vecRef.size(); ind++) {</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordtype">int</span> bit = (ind >> qubit) & 1; <span class="comment">// target-th bit</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">if</span> (bit == outcome)</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  prob += pow(abs(vecRef[ind]), 2);</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>  </div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="comment">// renormalise by the outcome prob</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> ind=0; ind<vecRef.size(); ind++) {</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordtype">int</span> bit = (ind >> qubit) & 1; <span class="comment">// target-th bit</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordflow">if</span> (bit == outcome)</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  vecRef[ind] /= sqrt(prob);</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">else</span> </div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  vecRef[ind] = 0;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  }</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  </div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> res = <a class="code" href="group__normgate.html#gab164930b260718d85ed3f55f50c76a59">collapseToOutcome</a>(vec, qubit, outcome);</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  REQUIRE( res == Approx(prob) );</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  REQUIRE( <a class="code" href="group__testutilities.html#ga45cc399adad2e2a67b0124851189fae5">areEqual</a>(vec, vecRef) );</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>  SECTION( <span class="stringliteral">"density-matrix"</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">// use a random density matrix for every qubit & outcome </span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <a class="code" href="group__testutilities.html#gabbc686f5f40eff22e08a2b2012ac4e41">QMatrix</a> matRef = <a class="code" href="group__testutilities.html#ga617b0fd1eb1c395762c937ad3b23e61b">getRandomDensityMatrix</a>(<a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a>);</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <a class="code" href="group__testutilities.html#gaf5a18d4c00dfe0523972be3bfc666362">toQureg</a>(mat, matRef);</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  </div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="comment">// prob is sum of diagonal amps (should be real) where target bit is outcome</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <a class="code" href="group__type.html#gad863c5878a01051a2726ce94bf365428">qcomp</a> tr = 0;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> ind=0; ind<matRef.size(); ind++) {</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordtype">int</span> bit = (ind >> qubit) & 1; <span class="comment">// qubit-th bit</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">if</span> (bit == outcome)</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  tr += matRef[ind][ind];</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>  REQUIRE( imag(tr) == Approx(0).margin(REAL_EPS) );</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> prob = real(tr);</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">// renorm (/prob) every |*outcome*><*outcome*| state, zeroing all others </span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> r=0; r<matRef.size(); r++) {</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> c=0; c<matRef.size(); c++) {</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordtype">int</span> ketBit = (c >> qubit) & 1;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordtype">int</span> braBit = (r >> qubit) & 1;</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>  <span class="keywordflow">if</span> (ketBit == outcome && braBit == outcome)</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  matRef[r][c] /= prob;</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  matRef[r][c] = 0;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  }</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  }</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  </div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> res = <a class="code" href="group__normgate.html#gab164930b260718d85ed3f55f50c76a59">collapseToOutcome</a>(mat, qubit, outcome);</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  REQUIRE( res == Approx(prob) );</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  REQUIRE( <a class="code" href="group__testutilities.html#ga45cc399adad2e2a67b0124851189fae5">areEqual</a>(mat, matRef) );</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  }</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  }</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  SECTION( <span class="stringliteral">"input validation"</span> ) {</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  </div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  SECTION( <span class="stringliteral">"qubit index"</span> ) {</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  </div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordtype">int</span> qubit = GENERATE( -1, <a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a> );</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordtype">int</span> outcome = 0;</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  REQUIRE_THROWS_WITH( <a class="code" href="group__normgate.html#gab164930b260718d85ed3f55f50c76a59">collapseToOutcome</a>(mat, qubit, outcome), Contains(<span class="stringliteral">"Invalid target qubit"</span>) );</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  }</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  SECTION( <span class="stringliteral">"outcome value"</span> ) {</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  </div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordtype">int</span> qubit = 0;</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordtype">int</span> outcome = GENERATE( -1, 2 );</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  REQUIRE_THROWS_WITH( <a class="code" href="group__normgate.html#gab164930b260718d85ed3f55f50c76a59">collapseToOutcome</a>(mat, qubit, outcome), Contains(<span class="stringliteral">"Invalid measurement outcome"</span>) );</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  }</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  SECTION( <span class="stringliteral">"outcome probability"</span> ) {</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  </div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <a class="code" href="group__init.html#ga2f049055d4a51d0ea4d1a43b5234dedb">initZeroState</a>(vec);</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  REQUIRE_THROWS_WITH( <a class="code" href="group__normgate.html#gab164930b260718d85ed3f55f50c76a59">collapseToOutcome</a>(vec, 0, 1), Contains(<span class="stringliteral">"Can't collapse to state with zero probability"</span>) );</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <a class="code" href="group__init.html#ga0379e21efca0767a22607fc0e26a5a22">initClassicalState</a>(vec, 1);</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  REQUIRE_THROWS_WITH( <a class="code" href="group__normgate.html#gab164930b260718d85ed3f55f50c76a59">collapseToOutcome</a>(vec, 0, 0), Contains(<span class="stringliteral">"Can't collapse to state with zero probability"</span>) );</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  }</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>  <a class="code" href="group__type.html#ga8e1e6ad3254892edc2ee08712ea9d692">destroyQureg</a>(vec, <a class="code" href="main_8cpp.html#a718130cc1fc36cde991aff3d4c85c47d">QUEST_ENV</a>);</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <a class="code" href="group__type.html#ga8e1e6ad3254892edc2ee08712ea9d692">destroyQureg</a>(mat, <a class="code" href="main_8cpp.html#a718130cc1fc36cde991aff3d4c85c47d">QUEST_ENV</a>);</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> }</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  </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>  </div>
<div class="line"><a name="l00121"></a><span class="lineno"><a class="line" href="group__unittest.html#ga1562bc2faa4f587e665f8974cbcc62f4"> 121</a></span> <a class="code" href="group__unittest.html#ga0168f7b5f09ccbb226144053ad1b7497">TEST_CASE</a>( <span class="stringliteral">"measure"</span>, <span class="stringliteral">"[gates]"</span> ) {</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  </div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <a class="code" href="structQureg.html">Qureg</a> vec = <a class="code" href="group__type.html#ga3392816c0643414165c2f5caeec17df0">createQureg</a>(<a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a>, <a class="code" href="main_8cpp.html#a718130cc1fc36cde991aff3d4c85c47d">QUEST_ENV</a>);</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <a class="code" href="structQureg.html">Qureg</a> mat = <a class="code" href="group__type.html#ga93e55b6650b408abb30a1d4a8bce757c">createDensityQureg</a>(<a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a>, <a class="code" href="main_8cpp.html#a718130cc1fc36cde991aff3d4c85c47d">QUEST_ENV</a>);</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  </div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  SECTION( <span class="stringliteral">"correctness"</span> ) {</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  </div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordtype">int</span> qubit = GENERATE( range(0,<a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a>) );</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  </div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="comment">// repeat these random tests 10 times on every qubit </span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  GENERATE( range(0,10) );</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>  SECTION( <span class="stringliteral">"state-vector"</span> ) {</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  </div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <a class="code" href="group__testutilities.html#gac9263a65c96a458b810b20baa81c5b94">QVector</a> vecRef = <a class="code" href="group__testutilities.html#gae1d2eb70b50267f8186cbd53e300d94f">getRandomStateVector</a>(<a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a>);</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <a class="code" href="group__testutilities.html#gaf5a18d4c00dfe0523972be3bfc666362">toQureg</a>(vec, vecRef);</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  </div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordtype">int</span> outcome = <a class="code" href="group__normgate.html#ga2a3794103125f1e3cfa103f8b1963656">measure</a>(vec, qubit);</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  REQUIRE( (outcome == 0 || outcome == 1) );</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>  <span class="comment">// calculate prob of this outcome</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> prob = 0;</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> ind=0; ind<vecRef.size(); ind++) {</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="keywordtype">int</span> bit = (ind >> qubit) & 1; <span class="comment">// target-th bit</span></div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keywordflow">if</span> (bit == outcome)</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  prob += pow(abs(vecRef[ind]), 2);</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>  </div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  REQUIRE( prob > REAL_EPS );</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  </div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="comment">// renormalise by the outcome prob</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> ind=0; ind<vecRef.size(); ind++) {</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keywordtype">int</span> bit = (ind >> qubit) & 1; <span class="comment">// target-th bit</span></div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordflow">if</span> (bit == outcome)</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  vecRef[ind] /= sqrt(prob);</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="keywordflow">else</span> </div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  vecRef[ind] = 0;</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>  REQUIRE( <a class="code" href="group__testutilities.html#ga45cc399adad2e2a67b0124851189fae5">areEqual</a>(vec, vecRef) );</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>  SECTION( <span class="stringliteral">"density-matrix"</span> ) {</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  </div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <a class="code" href="group__testutilities.html#gabbc686f5f40eff22e08a2b2012ac4e41">QMatrix</a> matRef = <a class="code" href="group__testutilities.html#ga617b0fd1eb1c395762c937ad3b23e61b">getRandomDensityMatrix</a>(<a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a>);</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <a class="code" href="group__testutilities.html#gaf5a18d4c00dfe0523972be3bfc666362">toQureg</a>(mat, matRef);</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  </div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keywordtype">int</span> outcome = <a class="code" href="group__normgate.html#ga2a3794103125f1e3cfa103f8b1963656">measure</a>(mat, qubit);</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  REQUIRE( (outcome == 0 || outcome == 1) );</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  </div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="comment">// compute prob of this outcome</span></div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> prob = 0;</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> ind=0; ind<matRef.size(); ind++) {</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keywordtype">int</span> bit = (ind >> qubit) & 1; <span class="comment">// qubit-th bit</span></div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="keywordflow">if</span> (bit == outcome)</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  prob += real(matRef[ind][ind]);</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  }</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  </div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  REQUIRE( prob > REAL_EPS );</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  </div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="comment">// renorm (/prob) every |*outcome*><*outcome*| state, zeroing all others </span></div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> r=0; r<matRef.size(); r++) {</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> c=0; c<matRef.size(); c++) {</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="keywordtype">int</span> ketBit = (c >> qubit) & 1;</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="keywordtype">int</span> braBit = (r >> qubit) & 1;</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  </div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="keywordflow">if</span> (ketBit == outcome && braBit == outcome)</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  matRef[r][c] /= prob;</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  matRef[r][c] = 0;</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  }</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  }</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>  REQUIRE( <a class="code" href="group__testutilities.html#ga45cc399adad2e2a67b0124851189fae5">areEqual</a>(mat, matRef) );</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  }</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  }</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  SECTION( <span class="stringliteral">"input validation"</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>  SECTION( <span class="stringliteral">"qubit index"</span> ) {</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  </div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keywordtype">int</span> qubit = GENERATE( -1, <a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a> );</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  REQUIRE_THROWS_WITH( <a class="code" href="group__normgate.html#ga2a3794103125f1e3cfa103f8b1963656">measure</a>(vec, qubit), Contains(<span class="stringliteral">"Invalid target qubit"</span>) );</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  }</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  }</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <a class="code" href="group__type.html#ga8e1e6ad3254892edc2ee08712ea9d692">destroyQureg</a>(vec, <a class="code" href="main_8cpp.html#a718130cc1fc36cde991aff3d4c85c47d">QUEST_ENV</a>);</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <a class="code" href="group__type.html#ga8e1e6ad3254892edc2ee08712ea9d692">destroyQureg</a>(mat, <a class="code" href="main_8cpp.html#a718130cc1fc36cde991aff3d4c85c47d">QUEST_ENV</a>);</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span> }</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"> 208</span>  </div>
<div class="line"><a name="l00213"></a><span class="lineno"><a class="line" href="group__unittest.html#ga61e1bd261993b019232f5d5214423280"> 213</a></span> <a class="code" href="group__unittest.html#ga0168f7b5f09ccbb226144053ad1b7497">TEST_CASE</a>( <span class="stringliteral">"measureWithStats"</span>, <span class="stringliteral">"[gates]"</span> ) {</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  </div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <a class="code" href="structQureg.html">Qureg</a> vec = <a class="code" href="group__type.html#ga3392816c0643414165c2f5caeec17df0">createQureg</a>(<a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a>, <a class="code" href="main_8cpp.html#a718130cc1fc36cde991aff3d4c85c47d">QUEST_ENV</a>);</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <a class="code" href="structQureg.html">Qureg</a> mat = <a class="code" href="group__type.html#ga93e55b6650b408abb30a1d4a8bce757c">createDensityQureg</a>(<a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a>, <a class="code" href="main_8cpp.html#a718130cc1fc36cde991aff3d4c85c47d">QUEST_ENV</a>);</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  </div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  SECTION( <span class="stringliteral">"correctness"</span> ) {</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  </div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keywordtype">int</span> qubit = GENERATE( range(0,<a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a>) );</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  </div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <span class="comment">// repeat these random tests 10 times on every qubit </span></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  GENERATE( range(0,10) );</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  </div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  SECTION( <span class="stringliteral">"state-vector"</span> ) {</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  </div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <a class="code" href="group__testutilities.html#gac9263a65c96a458b810b20baa81c5b94">QVector</a> vecRef = <a class="code" href="group__testutilities.html#gae1d2eb70b50267f8186cbd53e300d94f">getRandomStateVector</a>(<a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a>);</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <a class="code" href="group__testutilities.html#gaf5a18d4c00dfe0523972be3bfc666362">toQureg</a>(vec, vecRef);</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  </div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> res;</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="keywordtype">int</span> outcome = <a class="code" href="group__normgate.html#gae192ac0759e46c7b20a7182020155240">measureWithStats</a>(vec, qubit, &res);</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  REQUIRE( (outcome == 0 || outcome == 1) );</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>  <span class="comment">// calculate prob of this outcome</span></div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> prob = 0;</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> ind=0; ind<vecRef.size(); ind++) {</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keywordtype">int</span> bit = (ind >> qubit) & 1; <span class="comment">// target-th bit</span></div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="keywordflow">if</span> (bit == outcome)</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  prob += pow(abs(vecRef[ind]), 2);</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  }</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  </div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  REQUIRE( prob == Approx(res) );</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  </div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <span class="comment">// renormalise by the outcome prob</span></div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> ind=0; ind<vecRef.size(); ind++) {</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="keywordtype">int</span> bit = (ind >> qubit) & 1; <span class="comment">// target-th bit</span></div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="keywordflow">if</span> (bit == outcome)</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  vecRef[ind] /= sqrt(prob);</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="keywordflow">else</span> </div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  vecRef[ind] = 0;</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  }</div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  REQUIRE( <a class="code" href="group__testutilities.html#ga45cc399adad2e2a67b0124851189fae5">areEqual</a>(vec, vecRef) );</div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  }</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  SECTION( <span class="stringliteral">"density-matrix"</span> ) {</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  </div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <a class="code" href="group__testutilities.html#gabbc686f5f40eff22e08a2b2012ac4e41">QMatrix</a> matRef = <a class="code" href="group__testutilities.html#ga617b0fd1eb1c395762c937ad3b23e61b">getRandomDensityMatrix</a>(<a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a>);</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <a class="code" href="group__testutilities.html#gaf5a18d4c00dfe0523972be3bfc666362">toQureg</a>(mat, matRef);</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  </div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> res;</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  <span class="keywordtype">int</span> outcome = <a class="code" href="group__normgate.html#gae192ac0759e46c7b20a7182020155240">measureWithStats</a>(mat, qubit, &res);</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  REQUIRE( (outcome == 0 || outcome == 1) );</div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  </div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <span class="comment">// compute prob of this outcome</span></div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> prob = 0;</div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> ind=0; ind<matRef.size(); ind++) {</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="keywordtype">int</span> bit = (ind >> qubit) & 1; <span class="comment">// qubit-th bit</span></div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="keywordflow">if</span> (bit == outcome)</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  prob += real(matRef[ind][ind]);</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  }</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  </div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  REQUIRE( prob == Approx(res) );</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  </div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="comment">// renorm (/prob) every |*outcome*><*outcome*| state, zeroing all others </span></div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> r=0; r<matRef.size(); r++) {</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> c=0; c<matRef.size(); c++) {</div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keywordtype">int</span> ketBit = (c >> qubit) & 1;</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <span class="keywordtype">int</span> braBit = (r >> qubit) & 1;</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  </div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="keywordflow">if</span> (ketBit == outcome && braBit == outcome)</div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  matRef[r][c] /= prob;</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  matRef[r][c] = 0;</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  }</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>  </div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  REQUIRE( <a class="code" href="group__testutilities.html#ga45cc399adad2e2a67b0124851189fae5">areEqual</a>(mat, matRef) );</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  }</div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  }</div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  SECTION( <span class="stringliteral">"input validation"</span> ) {</div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  </div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  SECTION( <span class="stringliteral">"qubit index"</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>  <span class="keywordtype">int</span> qubit = GENERATE( -1, <a class="code" href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a> );</div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> res;</div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  REQUIRE_THROWS_WITH( <a class="code" href="group__normgate.html#gae192ac0759e46c7b20a7182020155240">measureWithStats</a>(vec, qubit, &res), Contains(<span class="stringliteral">"Invalid target qubit"</span>) );</div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  }</div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  }</div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  <a class="code" href="group__type.html#ga8e1e6ad3254892edc2ee08712ea9d692">destroyQureg</a>(vec, <a class="code" href="main_8cpp.html#a718130cc1fc36cde991aff3d4c85c47d">QUEST_ENV</a>);</div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  <a class="code" href="group__type.html#ga8e1e6ad3254892edc2ee08712ea9d692">destroyQureg</a>(mat, <a class="code" href="main_8cpp.html#a718130cc1fc36cde991aff3d4c85c47d">QUEST_ENV</a>);</div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span> }</div>
</div><!-- fragment --></div><!-- contents -->
<div class="ttc" id="amain_8cpp_html_a718130cc1fc36cde991aff3d4c85c47d"><div class="ttname"><a href="main_8cpp.html#a718130cc1fc36cde991aff3d4c85c47d">QUEST_ENV</a></div><div class="ttdeci">QuESTEnv QUEST_ENV</div><div class="ttdoc">The global QuESTEnv instance, to be created and destroyed once in this main(), so that the MPI enviro...</div><div class="ttdef"><b>Definition:</b> <a href="main_8cpp_source.html#l00020">main.cpp:20</a></div></div>
<div class="ttc" id="autilities_8hpp_html_a2f52338126bb8cdf7fcf68eaf01c546a"><div class="ttname"><a href="utilities_8hpp.html#a2f52338126bb8cdf7fcf68eaf01c546a">NUM_QUBITS</a></div><div class="ttdeci">#define NUM_QUBITS</div><div class="ttdoc">The default number of qubits in the registers created for unit testing (both statevectors and density...</div><div class="ttdef"><b>Definition:</b> <a href="utilities_8hpp_source.html#l00036">utilities.hpp:36</a></div></div>
<div class="ttc" id="aQuEST_8h_html"><div class="ttname"><a href="QuEST_8h.html">QuEST.h</a></div></div>
<div class="ttc" id="agroup__normgate_html_ga2a3794103125f1e3cfa103f8b1963656"><div class="ttname"><a href="group__normgate.html#ga2a3794103125f1e3cfa103f8b1963656">measure</a></div><div class="ttdeci">int measure(Qureg qureg, int measureQubit)</div><div class="ttdoc">Measures a single qubit, collapsing it randomly to 0 or 1.</div><div class="ttdef"><b>Definition:</b> <a href="QuEST_8c_source.html#l00756">QuEST.c:756</a></div></div>
<div class="ttc" id="agroup__type_html_ga7740e349b4f8bae6451547680f0ce2d6"><div class="ttname"><a href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a></div><div class="ttdeci">#define qreal</div></div>
<div class="ttc" id="agroup__testutilities_html_gaf5a18d4c00dfe0523972be3bfc666362"><div class="ttname"><a href="group__testutilities.html#gaf5a18d4c00dfe0523972be3bfc666362">toQureg</a></div><div class="ttdeci">void toQureg(Qureg qureg, QVector vec)</div><div class="ttdoc">Initialises the state-vector qureg to have the same amplitudes as vec.</div><div class="ttdef"><b>Definition:</b> <a href="utilities_8cpp_source.html#l00946">utilities.cpp:946</a></div></div>
<div class="ttc" id="agroup__normgate_html_gae192ac0759e46c7b20a7182020155240"><div class="ttname"><a href="group__normgate.html#gae192ac0759e46c7b20a7182020155240">measureWithStats</a></div><div class="ttdeci">int measureWithStats(Qureg qureg, int measureQubit, qreal *outcomeProb)</div><div class="ttdoc">Measures a single qubit, collapsing it randomly to 0 or 1, and additionally gives the probability of ...</div><div class="ttdef"><b>Definition:</b> <a href="QuEST_8c_source.html#l00743">QuEST.c:743</a></div></div>
<div class="ttc" id="agroup__testutilities_html_gac9263a65c96a458b810b20baa81c5b94"><div class="ttname"><a href="group__testutilities.html#gac9263a65c96a458b810b20baa81c5b94">QVector</a></div><div class="ttdeci">std::vector< qcomp > QVector</div><div class="ttdoc">A complex vector, which can be zero-initialised with QVector(numAmps).</div><div class="ttdef"><b>Definition:</b> <a href="utilities_8hpp_source.html#l00060">utilities.hpp:60</a></div></div>
<div class="ttc" id="agroup__type_html_gad863c5878a01051a2726ce94bf365428"><div class="ttname"><a href="group__type.html#gad863c5878a01051a2726ce94bf365428">qcomp</a></div><div class="ttdeci">#define qcomp</div></div>
<div class="ttc" id="agroup__type_html_ga8e1e6ad3254892edc2ee08712ea9d692"><div class="ttname"><a href="group__type.html#ga8e1e6ad3254892edc2ee08712ea9d692">destroyQureg</a></div><div class="ttdeci">void destroyQureg(Qureg qureg, QuESTEnv env)</div><div class="ttdoc">Deallocate a Qureg object representing a set of qubits.</div><div class="ttdef"><b>Definition:</b> <a href="QuEST_8c_source.html#l00075">QuEST.c:75</a></div></div>
<div class="ttc" id="agroup__testutilities_html_gae1d2eb70b50267f8186cbd53e300d94f"><div class="ttname"><a href="group__testutilities.html#gae1d2eb70b50267f8186cbd53e300d94f">getRandomStateVector</a></div><div class="ttdeci">QVector getRandomStateVector(int numQb)</div><div class="ttdoc">Returns a random numQb-length L2-normalised state-vector from an undisclosed distribution.</div><div class="ttdef"><b>Definition:</b> <a href="utilities_8cpp_source.html#l00453">utilities.cpp:453</a></div></div>
<div class="ttc" id="agroup__init_html_ga0379e21efca0767a22607fc0e26a5a22"><div class="ttname"><a href="group__init.html#ga0379e21efca0767a22607fc0e26a5a22">initClassicalState</a></div><div class="ttdeci">void initClassicalState(Qureg qureg, long long int stateInd)</div><div class="ttdoc">Initialise a set of qubits to the classical state (also known as a "computational basis state") with...</div><div class="ttdef"><b>Definition:</b> <a href="QuEST_8c_source.html#l00132">QuEST.c:132</a></div></div>
<div class="ttc" id="astructQureg_html"><div class="ttname"><a href="structQureg.html">Qureg</a></div><div class="ttdoc">Represents a system of qubits.</div><div class="ttdef"><b>Definition:</b> <a href="QuEST_8h_source.html#l00160">QuEST.h:160</a></div></div>
<div class="ttc" id="agroup__normgate_html_gab164930b260718d85ed3f55f50c76a59"><div class="ttname"><a href="group__normgate.html#gab164930b260718d85ed3f55f50c76a59">collapseToOutcome</a></div><div class="ttdeci">qreal collapseToOutcome(Qureg qureg, const int measureQubit, int outcome)</div><div class="ttdoc">Updates qureg to be consistent with measuring measureQubit in the given outcome (0 or 1),...</div><div class="ttdef"><b>Definition:</b> <a href="QuEST_8c_source.html#l00724">QuEST.c:724</a></div></div>
<div class="ttc" id="agroup__testutilities_html_gabbc686f5f40eff22e08a2b2012ac4e41"><div class="ttname"><a href="group__testutilities.html#gabbc686f5f40eff22e08a2b2012ac4e41">QMatrix</a></div><div class="ttdeci">std::vector< std::vector< qcomp > > QMatrix</div><div class="ttdoc">A complex square matrix.</div><div class="ttdef"><b>Definition:</b> <a href="utilities_8hpp_source.html#l00049">utilities.hpp:49</a></div></div>
<div class="ttc" id="agroup__type_html_ga3392816c0643414165c2f5caeec17df0"><div class="ttname"><a href="group__type.html#ga3392816c0643414165c2f5caeec17df0">createQureg</a></div><div class="ttdeci">Qureg createQureg(int numQubits, QuESTEnv env)</div><div class="ttdoc">Create a Qureg object representing a set of qubits which will remain in a pure state.</div><div class="ttdef"><b>Definition:</b> <a href="QuEST_8c_source.html#l00034">QuEST.c:34</a></div></div>
<div class="ttc" id="agroup__testutilities_html_ga617b0fd1eb1c395762c937ad3b23e61b"><div class="ttname"><a href="group__testutilities.html#ga617b0fd1eb1c395762c937ad3b23e61b">getRandomDensityMatrix</a></div><div class="ttdeci">QMatrix getRandomDensityMatrix(int numQb)</div><div class="ttdoc">Returns a random numQb-by-numQb density matrix, from an undisclosed distribution, in a very mixed sta...</div><div class="ttdef"><b>Definition:</b> <a href="utilities_8cpp_source.html#l00457">utilities.cpp:457</a></div></div>
<div class="ttc" id="agroup__unittest_html_ga0168f7b5f09ccbb226144053ad1b7497"><div class="ttname"><a href="group__unittest.html#ga0168f7b5f09ccbb226144053ad1b7497">TEST_CASE</a></div><div class="ttdeci">TEST_CASE("collapseToOutcome", "[gates]")</div><div class="ttdef"><b>Definition:</b> <a href="test__gates_8cpp_source.html#l00015">test_gates.cpp:15</a></div></div>
<div class="ttc" id="agroup__init_html_ga2f049055d4a51d0ea4d1a43b5234dedb"><div class="ttname"><a href="group__init.html#ga2f049055d4a51d0ea4d1a43b5234dedb">initZeroState</a></div><div class="ttdeci">void initZeroState(Qureg qureg)</div><div class="ttdoc">Initialise a set of qubits to the classical zero state .</div><div class="ttdef"><b>Definition:</b> <a href="QuEST_8c_source.html#l00111">QuEST.c:111</a></div></div>
<div class="ttc" id="agroup__testutilities_html_ga45cc399adad2e2a67b0124851189fae5"><div class="ttname"><a href="group__testutilities.html#ga45cc399adad2e2a67b0124851189fae5">areEqual</a></div><div class="ttdeci">bool areEqual(QVector a, QVector b)</div><div class="ttdoc">Returns true if the absolute value of the difference between every amplitude in vectors a and b is le...</div><div class="ttdef"><b>Definition:</b> <a href="utilities_8cpp_source.html#l00387">utilities.cpp:387</a></div></div>
<div class="ttc" id="agroup__type_html_ga93e55b6650b408abb30a1d4a8bce757c"><div class="ttname"><a href="group__type.html#ga93e55b6650b408abb30a1d4a8bce757c">createDensityQureg</a></div><div class="ttdeci">Qureg createDensityQureg(int numQubits, QuESTEnv env)</div><div class="ttdoc">Create a Qureg for qubits which are represented by a density matrix, and can be in mixed states.</div><div class="ttdef"><b>Definition:</b> <a href="QuEST_8c_source.html#l00048">QuEST.c:48</a></div></div>
<div class="ttc" id="autilities_8hpp_html"><div class="ttname"><a href="utilities_8hpp.html">utilities.hpp</a></div></div>
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