scqubits.FluxQubit.tphi_1_over_f_cc

FluxQubit.tphi_1_over_f_cc(A_noise=1e-07, i=0, j=1, esys=None, get_rate=False, **kwargs)

Calculate the 1/f dephasing time (or rate) due to critical-current noise from all three Josephson junctions \(EJ1\), \(EJ2\) and \(EJ3\). The combined noise is calculated by summing the rates from the individual contributions.

Parameters:

• A_noise (float) – noise strength

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

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

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

• get_rate (bool) – get rate or time

Return type:

float

Returns:

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