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arXiv · 2105.11038

Quasiparticle trapping by orbital effect in a hybrid superconducting-semiconducting circuit

Willemijn Uilhoorn·James G. Kroll·Arno Bargerbos·Syed D. Nabi·Chung-Kai Yang·Peter Krogstrup·Leo P. Kouwenhoven·Angela Kou·Gijs de Lange
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Abstract

The tunneling of quasiparticles (QPs) across Josephson junctions (JJs) detrimentally affects the coherence of superconducting and charge-parity qubits, and is shown to occur more frequently in magnetic fields. Here we demonstrate the parity lifetime to survive in excess of 50$\,\mathrm{\mu}$s in magnetic fields up to 1$\,$T, utilising a semiconducting nanowire transmon to detect QP tunneling in real time. We exploit gate-tunable QP filters and find magnetic-field-enhanced parity lifetimes, consistent with increased QP trapping by the ungated nanowire due to orbital effects. Our findings highlight the importance of QP trap engineering for building magnetic-field compatible hybrid superconducting circuits.

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Willemijn Uilhoorn, James G. Kroll, Arno Bargerbos, Syed D. Nabi, Chung-Kai Yang, Peter Krogstrup, Leo P. Kouwenhoven, Angela Kou, Gijs de Lange. 2021-05-23. Quasiparticle trapping by orbital effect in a hybrid superconducting-semiconducting circuit. https://arxiv.org/abs/2105.11038

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