rydiqule.sensor_utils.check_positive_semi_definite

rydiqule.sensor_utils.check_positive_semi_definite(dm: ndarray)

Checks if the provided matrices is a physical density matrix.

This is done by confirming each matrix of the stack is positive semi-definite.

Parameters:

dm (numpy.ndarray) – Stack of density matrices in rydiqule’s computational basis (i.e. real with ground state removed). Expected shape is (..., N) where N = basis_size**2-1.

Raises:

RydiquleError – If at least one density matrix of the stack is not positive semi-definite.