Time-Dependent Magnetic Flux in Devices for Circuit Quantum Electrodynamics

Recent theoretical work has highlighted that quantizing a superconducting circuit in the presence of time-dependent flux phi (t) generally produces Hamiltonian terms proportional to d phi/dt unless a special allocation of the flux across inductive terms is chosen. Here, we present an experiment probing the effects of a fast flux ramp applied to a heavy-fluxonium circuit. The experiment confirms that naive omission of the d phi/dt term leads to theoretical predictions inconsistent with experimental data. Experimental data are fully consistent with recent theory that includes the derivative term or equivalently uses "irrotational variables" that uniquely allocate the flux to properly eliminate the d phi/dt term.