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DY: Fachverband Dynamik und Statistische Physik

DY 15: Quantum Dynamics, Decoherence, Quantum Information

DY 15.2: Vortrag

Dienstag, 21. März 2017, 09:45–10:00, ZEU 160

Dissipative Floquet dynamics of a laser-driven quantum optical system — •Daniel Pagel, Andreas Alvermann, and Holger Fehske — Institut für Physik, Ernst-Moritz-Arndt-Universität, Felix-Hausdorff-Str. 6, 17489 Greifswald, Germany

A laser-driven quantum system is described by a Hamiltonian with a periodic time-dependence. In order to compute the dynamics of such a system, the simultaneous consideration of this periodicity and also of the coupling to environmental degrees of freedom is necessary. Then, the description is based on a Markovian master equation with time-dependent coefficients. To obtain a simpler differential equation with constant coefficients, the Floquet states have to be chosen as the computational basis. This procedure will be demonstrated in this talk for the example of few emitters strongly coupled to a cavity mode and driven by an external laser. As an evidence for the dynamic Stark effect, shifted peaks are observed in the emission spectra for different laser intensities. Analyzing the emission of nonclassical light with the Glauber function, we explain the additional features appearing for finite laser intensity in terms of the quasienergy spectrum of the driven emitter-cavity system. Finally, we study the generation of entanglement among two emitters, and show that the laser-excitation leads to a decrease of entanglement.