Andreev Modes from Phase Winding in a Full-Shell Nanowire-Based Transmon
Anders Kringhøj (University of Copenhagen)
Georg W. Winkler (University of California)
Thorvald W. Larsen (University of Copenhagen)
Deividas Sabonis (University of Copenhagen)
O. Erlandsson (University of Copenhagen)
P. Krogstrup (Microsoft Quantum Materials Lab Copenhagen, University of Copenhagen)
B. van Heck (TU Delft - BUS/Quantum Delft, Microsoft Quantum Lab Delft)
K. D. Petersson (University of Copenhagen)
C. M. Marcus (University of Copenhagen)
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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.