# cirq.is_unitary¶

cirq.is_unitary(matrix: numpy.ndarray, *, rtol: float = 1e-05, atol: float = 1e-08) → bool[source]

Determines if a matrix is approximately unitary.

A matrix is unitary if it’s square and its adjoint is its inverse.

Parameters
• matrix – The matrix to check.

• rtol – The per-matrix-entry relative tolerance on equality.

• atol – The per-matrix-entry absolute tolerance on equality.

Returns

Whether the matrix is unitary within the given tolerance.