Regensburg 2016 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 51: Delay and feedback Dynamics

DY 51.2: Talk

Thursday, March 10, 2016, 10:15–10:30, H47

Quantum coherent time-delayed feedback control of squeezing — •Manuel Kraft¹, Sven M. Hein¹, Judith Lehnert², Eckehard Schöll², Stephen Hughes³, Alexander Carmele¹, and Andreas Knorr¹ — ¹Technische Universität Berlin, Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Hardenbergstr. 36, 10623 Berlin, Germany — ²Technische Universität Berlin, Institut für Theoretische Physik, Nichtlineare Dynamik und Kontrolle, Hardenbergstr. 36, 10623 Berlin, Germany — ³Department of Physics, Engineering Physics and Astronomy, Queen’s University, Kingston, Ontario, Canada, K7L 3N6

Quantum coherent control schemes are measurement-free methods to control open quantum systems. In contrast to measurement-based schemes the control signals are fully quantum coherent and therefore do not introduce measurement induced noise into the system. We concentrate on the specific situation of a Pyragas-type control scheme where instantaneous and time-delayed signals are fed back directly into the quantum dynamics of the observable. In this talk we present how time-delayed quantum coherent self-feedback control [1, 2] can enhance the squeezing in the output fields of an externally pumped cavity containing a second order nonlinear crystal. This is of particular importance for phase and amplitude noise reduction.

[1] Carmele et al. Phys. Rev. Lett. 110, 013601 (2013)
[2] Schulze et al. Phys. Rev. A 89, 041801 (2014)