Experimental demonstration of coherent feedback control on optical field squeezing

Sanae Iida, Mitsuyoshi Yukawa, Hidehiro Yonezawa, Naoki Yamamoto, Akira Furusawa

Published 2011-03-07, updated 2012-09-26Version 2

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.