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

Abstract

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.

Flux-periodic oscillations in proximitized core–shell nanowires

“…Semiconductor nanowires with proximity-induced superconductivity incorporate both spin-dependent interactions and superconductor pairing [47,48]. In order to clarify the effects of cross-section geometry, Zeeman splitting and spin-orbit interaction on flux-periodicity, we explore magneto-oscillations in the energy spectrum of a proximitized core-shell nanowire in an external axial magnetic field, modeled by the Bogoliubov-de Gennes (BdG) Hamiltonian [49,50].…”