presence of time-dependent flux Φ (t) generally produces Hamiltonian terms proportional to
d Φ/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 naïve omission of the d Φ/dt term leads to theoretical
predictions inconsistent with experimental data. Experimental data are fully consistent with …