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Hybrid InSb nanowire-superconductor devices are promising for investigatingMajorana modes and topological quantum computation in solid-state devices. Anexperimental realisation of ballistic, phase-coherent superconductor-nanowirehybrid devices is a necessary step towards engineering topologicalsuperconducting electronics. Here, we report on a low-temperature transportstudy of Josephson junction devices fabricated from InSb nanowires grown bymolecular-beam epitaxy and provide a clear evidence for phase-coherent,ballistic charge transport through the nanowires in the junctions. Wedemonstrate that our devices show gate-tunable proximity-induced supercurrentand clear signatures of multiple Andreev reflections in the differentialconductance, indicating phase-coherent transport within the junctions. We alsoobserve periodic modulations of the critical current that can be associatedwith the Fabry-P\'{e}rot interference in the nanowires in the ballistictransport regime. Our work shows that the InSb nanowires grown bymolecular-beam epitaxy are of excellent material quality and hybridsuperconducting devices made from these nanowires are highly desirable forinvestigation of the novel physics in topological states of matter and forapplications in topological quantum electronics.

Coherent Charge Transport in Ballistic InSb Nanowire Josephson Junctions