Berlin 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 99: Poster Session: Transport
TT 99.46: Poster
Donnerstag, 15. März 2018, 15:00–19:00, Poster B
On unambigous quantum signatures in driven swept-bias Josephson junctions — •Harald Losert1, Karl Vogel1, and Wolfgang P. Schleich1,2 — 1Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm, D-89069 Ulm — 2Institute for Quantum Science and Engineering (IQSE), Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843
Josephson junctions are one of the best examples for the observation of macroscopic quantum tunneling. In the case of a current-biased Josephson junction the phase difference behaves like the position of a particle in a tilted washboard potential. The escape of this phase-particle corresponds to the voltage switching of the associated junction.
The escape from the potential can be explained by quantum tunneling from the ground state, or an excited state. However, it has been shown [1][2], that in the case of periodic driving the experimental data for quantum mechanical key features, e.g. Rabi oscillations or energy level quantization, can be reproduced by completely classical calculations.
Motivated by this discussion, we focus on the escape process in a swept-bias Josephson junction setup. We point out how a large or a small critical current of the junction affects the distinction between quantum and classical effects. In particular, we contrast the switching current distributions resulting from a quantum and a classical description of the time evolution in each case.
Marcheseet al., Eur. Phys. J. Special Topics 147, 333 (2007)
Blackburn et al., Phys. Rev. B 85, 104501 (2012)