scqubits.Cos2PhiQubit.hamiltonian

Cos2PhiQubit.hamiltonian(energy_esys=False)

Returns Hamiltonian in basis obtained by employing harmonic basis for \(\phi, \zeta\) and charge basis for \(\theta\) or in the eigenenerg basis.

Parameters:

energy_esys (Union[bool, Tuple[ndarray, ndarray]]) – If False (default), returns Hamiltonian in basis obtained by employing harmonic basis for \(\phi, \zeta\) and charge basis for \(\theta\). If True, the energy eigenspectrum is computed, returns Hamiltonian in the energy eigenbasis. If energy_esys = esys, where esys is a tuple containing two ndarrays (eigenvalues and energy eigenvectors), returns Hamiltonian in the energy eigenbasis, and does not have to recalculate eigenspectrum.

Return type:

csc_matrix

Returns:

Hamiltonian in chosen basis as csc_matrix. If the eigenenergy basis is chosen, unless energy_esys is specified, the Hamiltonian has dimensions of truncated_dim x truncated_dim. Otherwise, if eigenenergy basis is chosen, Hamiltonian has dimensions of m x m, for m given eigenvectors.