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Proposals for studying topological superconductivity and Majorana boundstates in nanowires proximity coupled to superconductors require that transportin the nanowire is ballistic. Previous work on hybrid nanowire-superconductorsystems has shown evidence for Majorana bound states, but these experimentswere also marked by disorder, which disrupts ballistic transport. In thisletter, we demonstrate ballistic transport in InSb nanowires interfaceddirectly with superconducting Al by observing quantized conductance atzero-magnetic field. Additionally, we demonstrate that the nanowire isproximity coupled to the superconducting contacts by observing Andreevreflection. These results are important steps for robustly establishingtopological superconductivity in InSb nanowires.

Hybrid Superconductor-Quantum Point Contact Devices using InSb Nanowires