  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.

Quantum Physics;Optics