Parity switching in a full-shell superconductor-semiconductor nanowire qubit

Understand

The rate of charge-parity switching in a full-shell superconductor-semiconductor nanowire qubit is measured by directly monitoring the dispersive shift of a readout resonator.

• At zero magnetic field, the measured switching time scale $T_P$ is on the order of 100 ms.
• Two-tone spectroscopy data post-selected on charge-parity is demonstrated.
• With increasing temperature or magnetic field, TP is at first constant, then exponentially suppressed, consistent with a model that includes both non-equilibrium and thermally activated quasiparticles.