Engineering Spectral Properties of Fluxonium through Josephson Plasma Frequency Optimization

The spectral properties of fluxonium exhibit significant variations depending on the circuit parameters E_J, E_C, and E_L. Exploring the large parameter space and the resulting properties that depend on the different combinations allows for the customizability of transition frequencies, matrix elements, and dispersive shifts. In this talk, we emphasize the ability to precisely design and fabricate desired fluxonium properties by optimization of the Josephson plasma frequency; which is tunable within the range of 10-100 GHz. This fabrication methodology paves the way for the exploration of new fluxonium parameter regimes with favorable properties.