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