A fluxonium qubit strongly coupled to a cavity enables Fock-state control and a flux-tunable Kerr nonlinearity that can be engineered to zero, a regime transmons cannot reach.
In Table I, the fluxo- nium circuit parameters, bare resonator frequencies, and their coupling strengths were tuned to simultaneously match spectroscopy data and measured χ and K
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Fluxonium as a control qubit for bosonic quantum information
A fluxonium qubit strongly coupled to a cavity enables Fock-state control and a flux-tunable Kerr nonlinearity that can be engineered to zero, a regime transmons cannot reach.