Experimental demonstration of coherent feedback control on optical field squeezing

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.

7 pages

References in corpus (4)

• Coherent quantum LQG control
• Observation of -9 dB quadrature squeezing with improvement of phase stability in homodyne measurement
• Coherent-feedback quantum control with a dynamic compensator
• Coherent-feedback control strategy to suppress spontaneous switching in ultra-low power optical bistability

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