Entanglement-enhanced time-continuous quantum control in optomechanics

TL;DR

This paper explores how entanglement in optomechanical systems can be harnessed through time-continuous quantum control to prepare and manipulate quantum states of mechanical oscillators, including cooling, entanglement, and squeezing.

Contribution

It introduces novel protocols for state preparation and entanglement generation in optomechanics using time-continuous control techniques in the blue detuned regime.

Findings

Feasible protocols for measurement-based feedback cooling.

Demonstration of bipartite mechanical entanglement via entanglement swapping.

Preparation of squeezed mechanical states through teleportation.

Abstract

The cavity-optomechanical radiation pressure interaction provides the means to create entanglement between a mechanical oscillator and an electromagnetic field interacting with it. Here we show how we can utilize this entanglement within the framework of time-continuous quantum control, in order to engineer the quantum state of the mechanical system. Specifically, we analyze how to prepare a low-entropy mechanical state by (measurement-based) feedback cooling operated in the blue detuned regime, the creation of bipartite mechanical entanglement via time-continuous entanglement swapping, and preparation of a squeezed mechanical state by time-continuous teleportation. The protocols presented here are feasible in optomechanical systems exhibiting a cooperativity larger than 1.