scqubits.TunableTransmon.t1_capacitive#

TunableTransmon.t1_capacitive(i=1, j=0, Q_cap=None, T=0.015, total=True, esys=None, get_rate=False, noise_op=None, branch_params=None)#

\(T_1\) due to dielectric dissipation in the Josephson junction capacitances.

References: Smith et al (2020), see also Nguyen et al (2019).

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

  • noise_op (ndarray | csc_matrix | Qobj | None) –

  • branch_params (dict | None) –

Returns:

time or rate –

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

in inverse units.

Return type:

float