Feedback control in quantum optics: an overview of experimental breakthroughs and areas of application

TL;DR

This paper reviews recent experimental advances in quantum feedback control in optics, highlighting techniques for stabilizing quantum states and improving measurement precision in various optical systems.

Contribution

It provides a comprehensive overview of experimental breakthroughs in quantum feedback control, covering a range of applications from amplitude squeezing to photon state stabilization.

Findings

Demonstrated stabilization of photon number states in microwave cavities

Enhanced quantum state control through feedback techniques

Progress in quantum non-demolition memory implementations

Abstract

We present a broad summary of research involving the application of quantum feedback control techniques to optical set-ups, from the early enhancement of optical amplitude squeezing to the recent stabilisation of photon number states in a microwave cavity, dwelling mostly on the latest experimental advances. Feedback control of quantum optical continuous variables, quantum non-demolition memories, feedback cooling, quantum state control, adaptive quantum measurements and coherent feedback strategies will all be touched upon in our discussion.