hqs_spin_mapper.extract_couplings

Determine the matrix- and tensor descriptions of the effective spin-bath model.

Functions

extract_quadratic(transformable_system)	Extract the coupling constants from the quadratic terms in the effective model Hamiltonian.
extract_quartic(transformable_system)	Extract the coupling constants from the quartic terms in the effective model Hamiltonian.

hqs_spin_mapper.extract_couplings.extract_quadratic(transformable_system: Supports_SW_Transformation) → Tuple[ndarray, ndarray, ndarray]

Extract the coupling constants from the quadratic terms in the effective model Hamiltonian.

Parameters:

transformable_system (Supports_SW_Transformation) – Container object for the transformed system data

Returns:

Tuple of matrices for the coupling constants.

Return type:

Tuple[np.ndarray, np.ndarray, np.ndarray]

Raises:

ValueError – Encountered invalid operator

hqs_spin_mapper.extract_couplings.extract_quartic(transformable_system: Supports_SW_Transformation) → ndarray

Extract the coupling constants from the quartic terms in the effective model Hamiltonian.

Parameters:

transformable_system (Supports_SW_Transformation) – Container object for the transformed system data

Returns:

Rank-4-Tensor of coupling constants (\(c^{\dagger}_{\uparrow} c^{\dagger}_{\downarrow} c_{\downarrow} c_{\uparrow}\)).

Return type:

np.ndarray