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TT: Fachverband Tiefe Temperaturen
TT 35: Superconducting Electronics: SQUIDs, Circuit QED
TT 35.10: Talk
Wednesday, March 20, 2024, 12:00–12:15, H 2053
Engineering the speedup of quantum tunneling in Josephson systems via dissipation — Johannes Hauff1, Joachim Ankerhold1, Gianluca Rastelli2, Wolfgang Belzig3, Sabine Andergassen4, and •Dominik Maile1 — 1Institute for Complex Quantum Systems, Ulm University — 2INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento — 3Fachbereich Physik, Universität Konstanz — 4Informatics, TU Wien
We theoretically investigate the escape rate occurring via quantum tunneling in a system affected by tailored dissipation. Specifically, we study the environmental assisted quantum tunneling of the superconducting phase in a current-biased Josephson junction. We consider Ohmic resistors inducing dissipation both in the phase and in the charge of the quantum circuit. We find that the charge dissipation leads to an enhancement of the quantum escape rate. This effect appears already in the low Ohmic regime and also occurs in the presence of phase dissipation that favors localization [1]. We further discuss the influence of temperature on the observed effect and possible technological applications.
[1] D. Maile, J.Ankerhold, S. Andergassen, W. Belzig, G. Rastelli Phys. Rev. B 106 (2022) 045408
Keywords: Open Quantum Systems; Dissipation; Decoherence; Josephson Junctions; Quantum Annealing