Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 79: Superconductivity: Superconducting Electronics - Circuit QED
TT 79.11: Talk
Thursday, March 15, 2018, 12:15–12:30, H 2053
Probing the strongly driven spin-boson model in a superconducting quantum circuit — L. Magazzù1, P. Forn-Diaz2, Ron Belyansky2, J.-L. Orgiazzi2, M.A. Yurtalan2, M.R. Otto2, A. Lupascu2, C. Wilson2, and •M. Grifoni3 — 1Institute of Physics, University of Augsburg, Universitätsstrasse 1, D-86135 Augsburg, Germany — 2Institute for Quantum Computing, University of Waterloo, Waterloo N2L 3G1, Canada — 3Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany
Quantum two-level systems interacting with the surroundings are ubiquitous in nature.
The interaction suppresses quantum coherence and forces the system towards a steady state. Such dissipative processes are captured by the paradigmatic spin-boson model, describing a two-state particle, the “spin”, interacting with an environment formed by harmonic oscillators. A fundamental question to date is to what extent intense coherent driving impacts a strongly dissipative system.
Here we investigate experimentally and theoretically a superconducting qubit strongly coupled to an electromagnetic environment and subjected to a coherent drive.
This setup realizes the driven Ohmic spin-boson model.
We show that the drive reinforces environmental suppression of quantum coherence, and that a coherent-to-incoherent transition can be achieved by tuning the drive amplitude. An out-of-equilibrium detailed balance relation
is demonstrated.
These results advance fundamental understanding of open quantum systems in the case of strong light-matter interaction.
arXiv:1709.01157