Dresden 2017 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 12: Delay and Feedback Dynamics

DY 12.6: Vortrag

Montag, 20. März 2017, 16:45–17:00, ZEU 147

Quantum coherent time-delayed feedback in cavity and waveguide QED — •Manuel Kraft, Fabian Faulstich, Sven M. Hein, Andreas Knorr, and Alexander Carmele — Technische Universität Berlin, Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Hardenbergstr. 36, 10623 Berlin, Germany

Quantum coherent control schemes provide efficient methods to control open quantum systems [1]. In this talk we focus specifically on quantum coherent self-feedback [2] in a cavity and waveguide QED geometry, where time-delayed quantum signals are fed back directly into system dynamics. In the cQED case, we present how time-delayed quantum coherent self-feedback control can be used to tailor the squeezing spectrum of the output fields of an externally pumped cavity containing a second order nonlinear crystal [3]. Extending the study to a half open waveguide, we investigate the impact of time-delayed feedback on the atom and photon bound states. Thereby we employ a Greens function method [4] based on the Lippmann Schwinger equation to approach the N-photon non-markovian feedback case.

[1] Lloyd, Phys. Rev. A 62, 022108 (2000)
[2] Carmele, et al. Phys. Rev. Lett. 110, 013601 (2013)
[3] Kraft, et al. Phys. Rev. A 94, 023806 (2016)
[4] Zheng, et al. Phys. Rev. Lett. 110, 113601 (2013)