SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Poster Session: Superconductivity
TT 5.17: Poster
Montag, 27. September 2021, 13:30–16:00, P
Exponential speedup of incoherent tunneling via dissipation — •Dominik Maile1,2,4, Sabine Andergassen2, Wolfgang Belzig1, and Gianluca Rastelli3 — 1Fachbereich Physik, Universität Konstanz — 2Institut für Theoretische Physik and Center for Quantum Science, Universität Tübingen — 3INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento — 4Institut für komplexe Quantensysteme, Universität Ulm
We study the escape rate of a particle in a metastable potential in the presence of a dissipative bath coupled to the momentum of the particle. Using the semiclassical bounce technique, we find that this rate is exponentially enhanced. In particular, the influence of momentum dissipation depends on the slope of the barrier that the particle is tunneling through. We investigate also the influence of dissipative baths coupled to the position, and to the momentum of the particle, respectively. In this case the rate exhibits a nonmonotonic behavior as a function of the dissipative coupling strengths. Remarkably, even in the presence of position dissipation, momentum dissipation can enhance exponentially the escape rate in a large range of the parameter space. Our theoretical findings can be directly tested in superconducting quantum circuits in which dissipative position and momentum interactions translate to dissipative phase or charge couplings. In particular, momentum/charge dissipation can be readily implemented simply using capacitances and resistances.