cirq.validate_density_matrix

Checks that the given density matrix is valid.

cirq.validate_density_matrix(
    density_matrix: np.ndarray,
    *,
    qid_shape: Tuple[int, ...],
    dtype: Optional['DTypeLike'] = None,
    atol: float = 1e-07
) -> None

Args
`density_matrix`	The density matrix to validate.
`qid_shape`	The expected qid shape.
`dtype`	The expected dtype.
`atol`	Absolute numerical tolerance.

Raises
`ValueError`	The density matrix does not have the correct dtype.
`ValueError`	The density matrix does not have the correct shape. It should be a square matrix with dimension prod(qid_shape).
`ValueError`	The density matrix is not Hermitian.
`ValueError`	The density matrix does not have trace 1.
`ValueError`	The density matrix is not positive semidefinite.

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Last updated 2024-06-27 UTC.

cirq.validate_density_matrix

Args

Raises