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TT: Fachverband Tiefe Temperaturen
TT 37: Quantum Coherence, Quantum Information Systems 1
TT 37.1: Vortrag
Mittwoch, 13. März 2013, 09:30–09:45, H19
Emission spectrum of the driven nonlinear oscillator — Stephan Andre1,2, •Lingzhen Guo1,3, Vittorio Peano4, Michael Marthaler1,2, and Gerd Schön1,2 — 1Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — 2DFG Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — 3Department of Physics, Beijing Normal University, Beijing 100875, China — 4Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
Motivated by recent “circuit QED” experiments [1,2] we investigate the noise properties of coherently driven nonlinear resonators. By using Josephson junctions in superconducting circuits, strong nonlinearities can be engineered, which lead to the appearance of pronounced effects already for a low number of photons in the resonator.
Based on a master equation approach we determine the emission spectrum and observe for typical circuit QED parameters,
in addition to the primary Raman-type peaks, second-order peaks [3]. These peaks describe higher harmonics
in the slow noise-induced fluctuations of the oscillation amplitude of the resonator and provide a clear signature of the nonlinear nature of the system.
[1] I. Siddiqi et al., Phys. Rev. B 73, 054510 (2006)
F.R. Ong et al., Phys. Rev. Lett. 106, 167002 (2011)
S. André et al., Phys. Rev. A 85, 053825 (2012)