Freiburg 2019 – wissenschaftliches Programm
FM 39.3: Talk
Dienstag, 24. September 2019, 14:45–15:00, 3044
Non-equilibrium quasiparticles in superconducting circuits: photons vs. phonons — •Gianluigi Catelani1 and Denis Basko2 — 1JARA Institute for Quantum Information, Forschungszentrum Jülich, Germany — 2CNRS, Grenoble, France
We study the effect of non-equilibrium quasiparticles on the operation of a superconducting device (a qubit or a resonator), including heating of the quasiparticles by the device operation. Focusing on the competition between heating via low-frequency photon absorption and cooling via photon and phonon emission, we obtain a remarkably simple non-thermal stationary solution of the kinetic equation for the quasiparticle distribution function. We estimate the influence of quasiparticles on relaxation and excitation rates for transmon qubits, and relate our findings to recent experiments.