Versatile and selective platform for high-quality hybrid semiconductor-superconductor nanowire devices.*

Majorana bound states and topological superconductivity are highly anticipated candidates for decoherence-free quantum computation. To achieve this goal, high-quality semiconductor-superconductor hybrid systems are the most promising platform. Here, we combine high-mobility semiconductor nanowires with selective deposition of a superconducting material, resulting in state-of-the-art hybrid devices. We benchmark our devices by investigating InSb/Al Josephson junctions. In voltage-bias spectroscopy, we observe multiple Andreev reflections indicating a highly-transparent interface. Furthermore, in current-bias spectroscopy we observe remarkably high critical currents. Finally, we emphasize that we have developed a versatile platform which can easily be used to investigate different material combinations. In addition, it can be used to create sophisticated quantum circuits for the purpose of demonstrating the proof of principle of a topological qubit.