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arXiv · 2202.05974

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

O. Erlandsson·D. Sabonis·A. Kringhøj·T. W. Larsen·P. Krogstrup·K. D. Petersson·C. M. Marcus
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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 $T_P$ 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. As TP is suppressed, qubit lifetime T1 also decreases. The long $T_P\sim 0.1$ s at zero field is promising for future development of qubits based on hybrid nanowires.

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O. Erlandsson, D. Sabonis, A. Kringhøj, T. W. Larsen, P. Krogstrup, K. D. Petersson, C. M. Marcus. 2022-02-12. Parity switching in a full-shell superconductor-semiconductor nanowire qubit. https://doi.org/10.1103/physrevb.108.l121406

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