Experimental demonstration of coherent feedback control on optical field squeezing
Sanae Iida, Mitsuyoshi Yukawa, Hidehiro Yonezawa, Naoki Yamamoto and, Akira Furusawa
TL;DR
This paper reports the first experimental demonstration of coherent feedback control to enhance optical field squeezing, confirming theoretical predictions and highlighting practical benefits and limitations in quantum optics.
Contribution
It provides the first experimental validation of coherent feedback control for optical squeezing, considering real-world delays and losses.
Findings
Coherent feedback improves optical squeezing as predicted by theory.
Experimental results align well with theoretical models including delays and losses.
Demonstrates practical benefits and limitations of coherent feedback in quantum optics.
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.
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