Electromotive force in driven topological quantum circuits
arXiv:2204.05087 · doi:10.1103/PhysRevB.106.035430
Abstract
Time-dependent control of superconducting quantum circuits is a prerequisite for building scalable quantum hardware. The quantum description of these circuits is complicated due to the electromotive force (emf) induced by time-varying magnetic fields. Here, we examine how the emf modifies the fractional Josephson effect. We show that a time-varying flux introduces a new term that depends on the geometry of both the circuit and the applied magnetic field. This term can be probed via current and charge measurements in closed-loop and open-circuit geometries. Our results refine the current understanding of how to properly describe time-dependent control of topological quantum circuits.
13 pages, 5 figures; added appendix C, added acknowledgments, improved overall flow, results and figures unchanged
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