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.
Cite
@article{arxiv.2202.05974,
title = {Parity switching in a full-shell superconductor-semiconductor nanowire qubit},
author = {O. Erlandsson and D. Sabonis and A. Kringhøj and T. W. Larsen and P. Krogstrup and K. D. Petersson and C. M. Marcus},
journal= {arXiv preprint arXiv:2202.05974},
year = {2023}
}