qit.utils.lmul

qit.utils.lmul(L, q=None)

Superoperator equivalent for multiplying from the left.

$$L\rho =\text{inv\_vec}(\text{lmul}(L)\text{vec}(\rho ))$$

Parameters

• L (array) – multiplying operator, shape == (m, p)

• q (int) – The shape of $\rho$ is (p, q). If q is not given, $\rho$ is assumed square.

Returns

superoperator that implements left multiplication of a vectorized matrix $\rho$ by the matrix L

Return type

array