Quantum circuits present a powerful framework for achieving new functionality by combining circuit elements into larger networks. However achieving quantitative modeling of large quantum circuits such as fluxonium, is hampered by non-linearity, interactions and a large number of degrees of freedom. In our paper we make use of approximate Unitary and Symmetric group symmetries to obtain new predictions for the energy spectrum of the fluxonium device which can be tested with current experimental technology.
Link: Physical Review X paper