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Bulletin of the American Physical Society

Bistability and Critical Slowing Down in Superconducting Circuits

Paul Brookes, Giovanna Tancredi, Themis Mavrogordatos, Andrew D. Patterson, Joseph Rahamim, Martina Esposito, Peter Leek, Eran Ginossar, Marzena Hanna Szymańska

Published Mar 5, 2019• 0 citations
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Critical slowing down of the time it takes a system to reach equilibrium is a key signature of bistability in dissipative first-order phase transitions. Understanding and characterizing this process can shed light on the underlying many-body dynamics that occur close to such a transition. Here, we explore the rich quantum activation dynamics and the appearance of critical slowing down in an engineered superconducting quantum circuit. Specifically, we investigate the intermediate bistable regime of the generalized Jaynes-Cummings Hamiltonian (GJC), realized by a circuit quantum electrodynamics (cQED) system consisting of a transmon qubit coupled to a microwave cavity. We find a previously unidentified regime of quantum activation in which the critical slowing down reaches saturation and, by comparing our experimental results with a range of models, we shed light on the fundamental role played by the qubit in this regime.