scqubits.TunableTransmon.t1_flux_bias_line#

TunableTransmon.t1_flux_bias_line(i=1, j=0, M=400, Z=50, T=0.015, total=True, esys=None, get_rate=False, noise_op_method=None)#

Noise due to a bias flux line.

References: Koch et al (2007), Groszkowski et al (2018)

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)

  • M (float) – Inductance in units of Phi_0 / Ampere

  • Z (Union[complex, float, Callable]) – A complex impedance; 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_method (Callable | None) –

Returns:

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

Return type:

float