Cavity optomechanics with feedback--controlled in--loop light

TL;DR

This paper provides a theoretical analysis of feedback-controlled in-loop light in cavity optomechanics, demonstrating its potential to enhance system efficiency, observe oscillations, improve cooling, and increase squeezing.

Contribution

It offers a detailed theoretical framework for in-loop light in optomechanics, exploring its capabilities and limitations for various quantum control applications.

Findings

In-loop cavities can observe coherent oscillations with weak coupling

Feedback control improves sideband cooling performance

Increased ponderomotive squeezing achievable with in-loop light

Abstract

It has recently been shown [Rossi et al., Phys. Rev. Lett. 119, 123603 (2017); ibid. 120, 073601 (2018)] that feedback--controlled in--loop light can be used to enhance the efficiency of optomechanical systems. We analyse the theoretical ground at the basis of this approach and explore its potentialities and limitations. We discuss the validity of the model, analyse the properties of in-loop cavities and we show how they can be used to observe coherent optomechanical oscillations also with weakly coupled system, improve the sideband cooling performance, and increase ponderomotive squeezing.