def check_cptp()

in src/braket/default_simulator/operation_helpers.py [0:0]

• 4 lines of code
• 3 McCabe index (conditional complexity)

def check_cptp(matrices: List[np.ndarray]):
    """Checks that the given matrices define a CPTP map.

    Args:
        matrices (List[np.ndarray]): The matrices to check

    Raises:
        ValueError: If the matrices do not define a CPTP map
    """
    E = sum([np.matmul(matrix.T.conjugate(), matrix) for matrix in matrices])
    if not np.allclose(E, np.eye(*E.shape)):
        raise ValueError(f"{matrices} do not define a CPTP map")