Andreev Modes from Phase Winding in a Full-Shell Nanowire-Based Transmon

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We investigate transmon qubits made from semiconductor nanowires with a fully surrounding superconducting shell. In the regime of reentrant superconductivity associated with the destructive Little-Parks effect, numerous coherent transitions are observed in the first reentrant lobe, where the shell carries 2 pi winding of superconducting phase, and are absent in the zeroth lobe. As junction density was increased by gate voltage, qubit coherence was suppressed then lost in the first lobe. These observations and numerical simulations highlight the role of winding-induced Andreev states in the junction.

Original languageEnglish
Article number047701
JournalPhysical Review Letters
Volume126
Issue number4
Number of pages6
ISSN0031-9007
DOIs
Publication statusPublished - 29 Jan 2021

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