Function shift

QAlg/ArithmeticUnit/ArithmeticUnit.cpp:192–201

* @brief Shift the quantum state one bit to the left * @ingroup ArithmeticUnit * @param[in] a qubits * @return QCircuit * @note The result of shift is saved in a. */

* @note The result of shift is saved in a.
*/
QCircuit shift(QVec& a)
{
    QCircuit circ;
    auto len = a.size();
    for (auto i = len - 1; i > 0; i--)
    {
        circ << SWAP(a[i], a[i - 1]);
    }
    return circ;
}

QCircuit QMultiplier(QVec& a, QVec& b, QVec& k, QVec& d)
{