dq.powm

powm(x: QArrayLike, n: int) -> QArray

Returns the \(n\)-th matrix power of a qarray.

Parameters:

• x (qarray-like of shape (..., n, n)) –

  Square matrix.

• n –

  Integer exponent.

Returns:

• (qarray of shape (..., n, n)) –

  Matrix power of x.

Examples:

>>> dq.powm(dq.sigmax(), 2)
QArray: shape=(2, 2), dims=(2,), dtype=complex64, layout=dia, ndiags=1
[[1.+0.j   ⋅   ]
 [  ⋅    1.+0.j]]