Time-Dependent Magnetic Flux in Devices for Circuit Quantum Electrodynamics

Jacob Bryon, D. K. Weiss, Xinyuan You, Sara Sussman, Xanthe Croot, Ziwen Huang, Jens Koch, Andrew A. Houck

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Recent theoretical work has highlighted that quantizing a superconducting circuit in the presence of time-dependent flux φ(t) generally produces Hamiltonian terms proportional to dφ/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 dφ/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 dφ/dt term.

Original languageEnglish (US)
Article number034031
JournalPhysical Review Applied
Issue number3
StatePublished - Mar 2023

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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