Function applyMultiStateControlledPhaseGadget

quest/src/api/operations.cpp:1353–1371

}

void applyMultiStateControlledPhaseGadget(Qureg qureg, int* controls, int* states, int numControls, int* targets, int numTargets, qreal angle) {
    validate_quregFields(qureg, __func__);
    validate_controlsAndTargets(qureg, controls, numControls, targets, numTargets, __func__);
    validate_controlStates(states, numControls, __func__);

    qreal phase = util_getPhaseFromGateAngle(angle);
    auto ctrlVec = util_getVector(controls, numControls);
    auto targVec = util_getVector(targets,  numTargets);
    auto stateVec = util_getVector(states,  numControls); // empty if states==nullptr
    localiser_statevec_anyCtrlPhaseGadget(qureg, ctrlVec, stateVec, targVec, phase);

    if (!qureg.isDensityMatrix)
        return;

    phase *= -1;
    ctrlVec = util_getBraQubits(ctrlVec, qureg);
    targVec = util_getBraQubits(targVec, qureg);
    localiser_statevec_anyCtrlPhaseGadget(qureg, ctrlVec, stateVec, targVec, phase);
}

} // end de-mangler