Function getRefProbInner

tests/utils/measure.cpp:61–70

qreal getRefProbInner(auto& state, vector<int> targets, vector<int> outcomes) {
    DEMAND( getLog2(state.size()) > *std::max_element(targets.begin(), targets.end()) );
    DEMAND( targets.size() == outcomes.size() );

    // <psi| (|o><o| (x) I) |psi> = Tr( (|o><o| (x) I) rho)
    int numQubits = getLog2(state.size());
    qmatrix projector = getProjector(targets, outcomes, numQubits);
    qcomp value = getReferenceExpectationValue(state, projector); // ~0
    return std::real(value);
}
qreal getReferenceProbability(qvector state, vector<int> targets, vector<int> outcomes) { return getRefProbInner(state, targets, outcomes); }
qreal getReferenceProbability(qmatrix state, vector<int> targets, vector<int> outcomes) { return getRefProbInner(state, targets, outcomes); }