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Experimental demonstration of coherent feedback control on optical field squeezing
Preprint
2011-03-07
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Abstract
Coherent feedback is a non-measurement based, hence a back-action free, method of
control for quantum systems. A typical application of this control scheme is squeezing
enhancement, a purely non-classical effect in quantum optics. In this paper we report
its first experimental demonstration that well agrees with the theory taking into
account time delays and losses in the coherent feedback loop. The results clarify
both the benefit and the limitation of coherent feedback control in a practical situation.