scqubits.TunableTransmon.tphi_1_over_f

TunableTransmon.tphi_1_over_f(A_noise, i, j, noise_op, esys=None, get_rate=False, **kwargs)

Calculate the 1/f dephasing time (or rate) due to arbitrary noise source.

We assume that the qubit energies (or the passed in eigenspectrum) has units of frequency (and not angular frequency).

Parameters:

  • A_noise (float) – noise strength

  • i (int >=0) – state index that along with j defines a qubit

  • j (int >=0) – state index that along with i defines a qubit

  • noise_op (Union[ndarray, csc_matrix]) – noise operator, typically Hamiltonian derivative w.r.t. noisy parameter

  • esys (Tuple[ndarray, ndarray]) – evals, evecs tuple

  • get_rate (bool) – get rate or time

Returns:

time or rate – decoherence time in units of \(2\pi ({\rm system\,\,units})\), or rate in inverse units.

Return type:

float