optimization.py 文件源码

def Energy_Estimate(data, pauli_list):
    """Compute expectation value of a list of diagonal Paulis with
    coefficients given measurement data. If somePaulis are non-diagonal
    appropriate post-rotations had to be performed in the collection of data

    Args:
        data : output of the execution of a quantum program
        pauli_list : list of [coeff, Pauli]
    Returns:
        The expectation value
    """
    energy = 0
    if np.ndim(pauli_list) == 1:
        energy = pauli_list[0] * measure_pauli_z(data, pauli_list[1])
    else:
        for p in pauli_list:
            energy += p[0] * measure_pauli_z(data, p[1])
    return energy