Gatemon qubit based on a thin InAs-Al hybrid nanowire

TL;DR

This paper demonstrates a gate-tunable superconducting qubit based on a thin InAs-Al nanowire, achieving strong coupling with a microwave cavity and providing insights relevant for Majorana zero mode detection.

Contribution

It introduces a gatemon qubit utilizing a thin InAs-Al nanowire, showing controllable Josephson energy and potential for Majorana mode detection.

Findings

Achieved $T_1$ relaxation time of ~0.56 μs.

Achieved $T_2^*$ dephasing time of ~0.38 μs.

Demonstrated strong coupling to microwave cavity.

Abstract

We study a gate-tunable superconducting qubit (gatemon) based on a thin InAs-Al hybrid nanowire. Using a gate voltage to control its Josephson energy, the gatemon can reach the strong coupling regime to a microwave cavity. In the dispersive regime, we extract the energy relaxation time $T_1\sim$0.56 $\mu$s and the dephasing time $T_2^* \sim$0.38 $\mu$s. Since thin InAs-Al nanowires can have fewer or single sub-band occupation and recent transport experiment shows the existence of nearly quantized zero-bias conductance peaks, our result holds relevancy for detecting Majorana zero modes in thin InAs-Al nanowires using circuit quantum electrodynamics.