Controlling the Josephson Potential of a Hybrid Nanowire Fluxonium Qubit - Part II

Hybrid superconducting qubits have emerged as a promising route to extend the tunability and functionality of conventional superconducting circuits. We explore a hybrid gated fluxonium qubit that integrates a conventional Josephson junction array composed of superconductor–insulator–superconductor (S-I-S) junctions with a gate-tunable nanowire-based superconductor–semiconductor–superconductor (S-Sm-S) junction as the main Josephson element. This configuration provides in situ tunability of both the flux through the loop and the Josephson energy via electrostatic gating. In this second talk, we discuss the fabrication and experimental characterization of the hybrid gated fluxonium qubit. We present measurements that reveal how gate control modifies the fluxonium spectrum and enables access to new regimes of circuit behavior.