rydiqule.sensor_utils.convert_complex_to_dm

rydiqule.sensor_utils.convert_complex_to_dm(complex_dm: ndarray) → ndarray

Converts a standard density matrices in the complex basis with ground state into rydiqule’s computational real basis with ground state removed.

rydiqule’s built-in functions do not return complex density matrices, so this function is used

internally and to undo the conversion of convert_dm_to_complex().

Parameters:

complex_dm (numpy.ndarray) – Stack of density matrices in the complex basis with ground state present. Has shape of (..., b, b) where b is the number of states in the basis.

Returns:

Density matrices in rydiqule’s computational basis (real with state 0 removed). Has shape (..., b**2-1).

Return type:

numpy.ndarray

Raises:

• RydiquleError – If the provided density matrices are not square.

• RydiquleError – If the converted matrix is not real (implies non-hermitian)