Function applyMultiStateControlledSqrtSwap

quest/src/api/operations.cpp:739–759

}

void applyMultiStateControlledSqrtSwap(Qureg qureg, int* controls, int* states, int numControls, int target1, int target2) {
    validate_quregFields(qureg, __func__);
    validate_controlsAndTwoTargets(qureg, controls, numControls, target1, target2, __func__);
    validate_controlStates(states, numControls, __func__); // permits states==nullptr

    /// @todo
    /// this function exacts sqrtSwap as a dense 2-qubit matrix,
    /// where as bespoke communication and simulation strategy is
    /// clearly possible which we have not supported because the gate
    /// is somewhat esoteric. As such, we must validate mixed-amps fit

    validate_mixedAmpsFitInNode(qureg, 2, __func__); // to throw SqrtSwap error, not generic CompMatr2 error

    CompMatr2 matr = getCompMatr2({
        {1, 0, 0, 0},
        {0, .5+.5_i, .5-.5_i, 0},
        {0, .5-.5_i, .5+.5_i, 0},
        {0, 0, 0, 1}});

    applyMultiStateControlledCompMatr2(qureg, controls, states, numControls, target1, target2, matr);
}

} // end de-mangler