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

Journal article (2021)

Authors

A. Kringhøj University of Copenhagen

G. W. Winkler University of California

T. W. Larsen University of Copenhagen

D. Sabonis University of Copenhagen

O. Erlandsson University of Copenhagen

P. Krogstrup University of Copenhagen, Microsoft Quantum Materials Lab Copenhagen

B. van Heck BUS/Quantum Delft - QuTech Advanced Research Centre , Microsoft Quantum Lab Delft

K. D. Petersson University of Copenhagen

C. M. Marcus University of Copenhagen

Research Group

BUS/Quantum Delft (QuTech Advanced Research Centre) (TU Delft)

DOI: https://doi.org/10.1103/PhysRevLett.126.047701

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Published Date

2021

Language

English

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Faculty

QuTech Advanced Research Centre

Department

Business Development

Research Group

BUS/Quantum Delft

Abstract

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 2π 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.

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