Magnetic-Field-Compatible Superconducting Transmon Qubit

TL;DR

This paper demonstrates a superconducting transmon qubit compatible with high magnetic fields up to 1 Tesla, revealing flux-dependent oscillations and emergent modes linked to Andreev states, advancing quantum device robustness.

Contribution

It introduces a hybrid semiconductor-superconductor qubit that maintains coherence at high magnetic fields and uncovers new interactions with Andreev states.

Findings

Qubit remains coherent at magnetic fields up to 1 T

Flux-dependent oscillations in qubit frequency observed

Emergence of additional modes linked to Andreev states

Abstract

We present a hybrid semiconductor-based superconducting qubit device which remains coherent at magnetic fields up to 1 T. The qubit transition frequency exhibits periodic oscillations with magnetic field, consistent with interference effects due to the magnetic flux threading the cross section of the proximitized semiconductor nanowire junction. As induced superconductivity revives, additional coherent modes emerge at high magnetic fields, which we attribute to the interaction of the qubit and low-energy Andreev states.