scqubits.Cos2PhiQubit.t1_purcell#

Cos2PhiQubit.t1_purcell(i=1, j=0, Q_cap=None, T=0.015, total=True, esys=None, get_rate=False)#

\(T_1\) due to dielectric dissipation in the shunt capacitor.

References: Nguyen et al (2019), Smith et al (2020)

Parameters:

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

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

  • Q_cap (Union[float, Callable, None]) – capacitive quality factor; a fixed value or function of omega

  • T (float) – temperature in Kelvin

  • total (bool) – if False return a time/rate associated with a transition from state i to state j. if True return a time/rate associated with both i to j and j to i transitions

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

  • get_rate (bool) – get rate or time

Returns:

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

Return type:

time or rate