Microwave characterization of hybrid superconductor-semiconductor junction arrays

Arrays of Josephson junctions can achieve a nondissipative impedance much larger than the impedance of free space. These devices have largely been limited to Al/AlOx tunnel junction arrays, but a superconductor-semiconductor (S-Sm) junction array could be of interest for its application in a voltage tunable superconducting quantum circuit architecture. We show microwave measurements on an S-Sm array to study microwave loss, nonlinearity, and phase slip dynamics in S-Sm junctions. We also show preliminary results with a S-SM array incorporated in a fluxonium style qubit.