Realization of microwave quantum circuits using hybrid superconducting-semiconducting nanowire Josephson elements

TL;DR

This paper demonstrates the creation of microwave quantum circuits using hybrid superconductor-semiconductor Josephson elements, enabling tunable qubits and potential operation in magnetic fields, advancing quantum computing hardware.

Contribution

It introduces hybrid InAs nanowire Josephson elements integrated into microwave circuits, showing tunable qubit behavior and flux-dependent properties not previously realized.

Findings

Capacitively-shunted hybrid elements act as transmon qubits.

Two-element circuits exhibit flux-dependent behavior, including flux qubits.

Hybrid Josephson elements are promising for magnetic field applications.

Abstract

We report the realization of quantum microwave circuits using hybrid superconductor-semiconductor Josephson elements comprised of InAs nanowires contacted by NbTiN. Capacitively-shunted single elements behave as transmon qubits with electrically tunable transition frequencies. Two-element circuits also exhibit transmon-like behavior near zero applied flux, but behave as flux qubits at half the flux quantum, where non-sinusoidal current-phase relations in the elements produce a double-well Josephson potential. These hybrid Josephson elements are promising for applications requiring microwave superconducting circuits operating in magnetic field.