cirq.density_matrix

Create a QuantumState object from a density matrix.

cirq.density_matrix(
    state: np.ndarray,
    qid_shape: Optional[Tuple[int, ...]] = None,
    *,
    copy: bool = False,
    validate: bool = True,
    dtype: Optional['DTypeLike'] = None,
    atol: float = 1e-07
) -> cirq.QuantumState

state The density matrix.
qid_shape The qid shape.
copy Whether to copy the density matrix.
validate Whether to check if the given data and qid shape represent a valid quantum state with the given dtype.
dtype The expected data type.
atol Absolute numerical tolerance to use for validation.

ValueError Invalid density matrix.