Loss mechanisms in fluxonium molecules

Multimode superconducting circuits can be designed to be minimally affected by dominant noise channels. One such noise-protected qubit is the fluxonium molecule, which is composed of two fluxonia with strong inductive coupling. This circuit promises long relaxation times due to near-disjoint support of the qubit states, along with partial protection against dephasing due to first-order insensitivity to flux noise at sweet-spots. We investigate the dominant loss and dephasing mechanisms of the fluxonium molecule by performing noise spectroscopy across different flux operating points. We further investigate the possibility of additional protection against flux dephasing through flux driving the fluxonium molecule and report on our progress toward building a strongly-driven Floquet fluxonium molecule.