SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 20: Superconductivity: Tunnelling and Josephson Junctions
TT 20.9: Vortrag
Dienstag, 28. März 2023, 11:45–12:00, HSZ 103
Engineering the speedup of quantum tunneling in Josephson systems via dissipation — •Dominik Maile1, Joachim Ankerhold1, Sabine Andergassen2, Wolfgang Belzig3, and Gianluca Rastelli4 — 1Institut für Komplexe Quantensysteme, Universität Ulm — 2Institut für Theoretische Physik and Center for Quantum Science, Universität Tübingen — 3Fachbereich Physik, Universität Konstanz — 4INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento
We theoretically investigate the escape rate occurring via quantum tunneling in a system affected by tailored dissipation [1]. 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. Inserting realistic circuit parameters, we address the question of its experimental observability and discuss suitable parameter spaces for the observation of the enhanced rate.
[1] D.Maile et al., PRB 106, 045408 (2022)