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Time-delayed quantum coherent Pyragas feedback control of photon squeezing in a degenerate parametric oscillator

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arxiv 1603.07137 v1 pith:VTEDC5S3 submitted 2016-03-23 quant-ph

Manuel Kraft , Sven Moritz Hein , Judith Lehnert , Eckehard Schöll , Stephen Hughes , Andreas Knorr This is my paper · ORCID
classification quant-ph
keywords feedbackcontrolquantumtime-delayedcoherentsqueezingdegeneratedegree
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Quantum coherent feedback control is a measurement-free control method fully preserving quantum coherence. In this paper we show how time-delayed quantum coherent feedback can be used to control the degree of squeezing in the output field of a cavity containing a degenerate parametric oscillator. We focus on the specific situation of Pyragas-type feedback control where time-delayed signals are fed back directly into the quantum system. Our results show how time-delayed feedback can enhance or decrease the degree of squeezing as a function of time delay and feedback strength.

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