Magnetic-field-compatible hybrid superconducting circuits*

Hybrid circuits that incorporate semiconducting elements into superconducting circuits have recently provided new insights into mesoscopic superconductivity. Extending the capabilities of hybrid circuits to work in large magnetic fields would enable the investigation and control of spin-polarized and topological phenomena. In this talk, I will discuss our work building a magnetic-field-compatible nanowire-based fluxonium. We in-situ tune the Josephson energy of the fluxonium with an electrostatic gate and demonstrate operation of the fluxonium in magnetic fields up to 1T. We use the fluxonium spectrum to map out the dependence of the Josephson energy of the junction on magnetic field and also use it to observe the φ₀-junction effect. Our work demonstrates the utility of hybrid superconducting circuits for exploring mesoscopic physics and paves the way for manipulating Majorana zero modes in these circuits.