Optimized Readout of a Fluxonium Qubit

Much attention has focused on the transmon architecture for large-scale quantum devices, however, the fluxonium qubit has emerged as a possible successor. With an additional shunting inductor in parallel, the fluxonium offers larger anharmonicity and stronger protection against dialectric loss, leading to higher coherence times. The extra inductive element of the fluxonium qubit leads to a rich dispersive shift landscape when tuning the external flux. Here we propose to exploit the features in the dispersive shift to improve qubit readout using fast flux pulsing. Specifically, we report on theoretical simulations showing improved readout times and error rates by performing the readout at a flux bias point with large dispersive shift. We suggest optimal energy parameters for the fluxonium architecture that will allow for the implementation of our proposed readout scheme.