Characterizing Nanowire Gate-Tunable Fluxonium Qubits

Superconducting qubits have become one of the most prominent candidates for quantum computing and a platform to explore various physical regimes. We explore the operation of a hybrid gated-fluxonium qubit made from a conventional Josephson junction array using superconductor-insulator-superconductor (SIS) junctions and a gate-tunable nanowire superconductor-normal-superconductor (SNS) Josephson junction in parallel. Two in situ controllable parameters---tuning the external flux piercing the loop of the device and the Josephson energy using an applied gate voltage---give an opportunity to explore novel physical behavior in this qubit platform. We discuss design considerations and characterize the performance of this device.