Function applyForcedQubitMeasurement

quest/src/api/operations.cpp:1634–1651

}

qreal applyForcedQubitMeasurement(Qureg qureg, int target, int outcome) {
    validate_quregFields(qureg, __func__);
    validate_target(qureg, target, __func__);
    validate_measurementOutcomeIsValid(outcome, __func__);

    // note that we do not merely invoke applyForcedMultiQubitMeasurement()
    // because we must validate the renormalising probability and
    // report this function's name during the error message
    qreal prob = calcProbOfQubitOutcome(qureg, target, outcome); // harmlessly re-validates
    validate_measurementOutcomeProbNotZero(outcome, prob, __func__);

    // project to the outcome, renormalising the surviving states
    (qureg.isDensityMatrix)?
        localiser_densmatr_multiQubitProjector(qureg, {target}, {outcome}, prob):
        localiser_statevec_multiQubitProjector(qureg, {target}, {outcome}, prob);

    return prob;
}

qindex applyMultiQubitMeasurement(Qureg qureg, int* qubits, int numQubits) {
    validate_quregFields(qureg, __func__);