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TT: Fachverband Tiefe Temperaturen

TT 49: Poster Session: Superconductivity

TT 49.28: Poster

Mittwoch, 3. April 2019, 15:00–18:30, Poster D

Multi-level Rabi transitions in driven swept-bias Josephson junctions — •Harald Losert¹, Karl Vogel¹, and Wolfgang P. Schleich^1,2 — ¹Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQ^ST), 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 a well-known model system for the observation of quantum tunneling. The phase difference in a current-biased junction behaves like the position of a particle in a tilted washboard potential.
The escape of this phase-particle 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 presence of a periodic driving field even a classical theory reproduces the experimental data for quantum mechanical key features, e.g. energy level quantization.
Resuming this discussion, we theoretically investigate the multi-peak structures observed in the switching current distributions of swept-bias experiments. We identify these resonances as (higher order) Rabi oscillations between various energy levels of the washboard potential and suspect that this phenomenon cannot be explained by a classical model.
Marchese et al., Eur. Phys. J. Special Topics 147, 333 (2007)
Blackburn et al., Phys. Rev. B 85, 104501 (2012)