  Much attention has focused on the transmon architecture for large-scale
superconducting quantum devices, however, the fluxonium qubit has emerged as a
possible successor. With a shunting inductor in parallel to a Josephson
junction, the fluxonium offers larger anharmonicity and stronger protection
against dielectric loss, leading to higher coherence times as compared to
conventional transmon qubits. The interplay between the inductive and Josephson
energy potentials 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. 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 expand the scheme to include different error channels, and show that
with an integration time of 155 ns, flux-pulse-assisted readout offers about 5
times improvement in the signal to noise ratio. Moreover, we show that the
performance improvement persists in the presence of finite measurement
efficiency combined with quasi-static flux noise, and also when considering the
increased Purcell rate at the flux-pulse-assisted readout point. We suggest a
set of reasonable energy parameters for the fluxonium architecture that will
allow for the implementation of our proposed flux-pulse-assisted readout
scheme.
