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

Deividas Sabonis
ETH Zurich, Switzerland

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 Tp 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. As Tp is suppressed, qubit lifetime T1 also decreases. The long Tp ∼ 0.1 s at zero field is promising for future development of qubits based on hybrid nanowires.

References:
[1] arXiv:2202.05974