qudit_sim.HamiltonianBuilder.change_frame

HamiltonianBuilder.change_frame(tlist, obj, from_frame, to_frame=None, objtype='evolution', t0=None)

Apply the change-of-frame unitaries to states, unitaries, hamiltonians, and observables.

Parameters

  • tlist (numpy.ndarray) – 1D array of shape (T,) representing the time points.

  • obj (Union[numpy.ndarray, Qobj]) – Qobj or an array of shape either (D) (state), (T, D) (state evolution), (T, D, D) (evolution operator, time-dependent Hamiltonian, or an observable), (D, D) (evolution operator for a single time point, Hamiltonian, or an observable), (N, D, D) (multiple observables), or (N, T, D, D) (multiple time-dependent observables), where D is the dimension of the quantum system (num_levels ** num_qudits) and N is the number of observables.

  • from_frame (Union[str, Dict[Hashable, Frame], Sequence[Frame]]) – Specification of original frame.

  • to_frame (Union[str, Dict[Hashable, Frame], Sequence[Frame], None]) – Specification of new frame. If None, the current frame is used.

  • objtype (str) – 'state', 'evolution', 'hamiltonian', or 'observable'. Ignored when the type can be unambiguously inferred from the shape of obj.

  • t0 (Optional[float]) – Initial time for the frame change of the evolution operator. If None, tlist[0] is used.

Return type

numpy.ndarray

Returns

An array representing the frame-changed object.