Heaviness dependent characterization of coherence properties of Fluxnoium Qubit

The fluxonium exhibits a rich energy structure, long coherence times and large anharmonicity that pushes this architecture as a forerunner for the next generation of superconducting quantum computers. In the parameter space of the fluxonium qubit, heaviness defined by the capacitance of the shunting capacitor controls the disjoint support and the flux sensitivity of the qubit. We report a study of the coherence characteristics of the fluxonium qubit at the flux symmetry points as a function of heaviness. We further investigate the sources of the flux noise affecting the fluxonium qubit which become evident as the heaviness increases.