scqubits.Fluxonium.n_operator#
- Fluxonium.n_operator(energy_esys=False)[source]#
Returns the \(n = - i d/d\phi\) operator in the LC harmonic oscillator or eigenenergy basis.
- Parameters:
energy_esys (
Union
[bool
,Tuple
[ndarray
,ndarray
]]) – If False (default), returns the \(n = - i d/d\phi\) operator in the LC harmonic oscillator basis. If True, the energy eigenspectrum is computed, returns the \(n = - i d/d\phi\) operator in the energy eigenbasis. If energy_esys = esys, where esys is a tuple containing two ndarrays (eigenvalues and energy eigenvectors), returns the \(n = - i d/d\phi\) operator in the energy eigenbasis, and does not have to recalculate eigenspectrum.- Return type:
ndarray
- Returns:
Operator \(n = - i d/d\phi\) in chosen basis as ndarray. If the eigenenergy basis is chosen, unless energy_esys is specified, \(n = - i d/d\phi\) has dimensions of truncated_dim x truncated_dim. Otherwise, if eigenenergy basis is chosen, \(n = - i d/d\phi\) has dimensions of m x m, for m given eigenvectors.