Strong quantum entanglement via a controllable four wave mixing mechanism in an optomechanical system

TL;DR

This paper presents a method to generate strong, robust quantum entanglement in a controllable optomechanical system using a four wave mixing mechanism driven by a two-tone pump, effective even at room temperature.

Contribution

It introduces a novel entanglement generation scheme via controllable four wave mixing in a weak coupling optomechanical system, achieving high entanglement degrees.

Findings

Achieves over 16 dB entanglement in realistic systems.

Entanglement remains above 3 dB at room temperature.

Robustness against thermal noise demonstrated.

Abstract

We propose an approach to generate strong quantum entanglement by the controllable four wave mixing mechanism in a single cavity, weak coupling optomechanical system. The optomechanical system is driven by a strong two tone pump field and a weak signal field, simultaneously. The two tone pump field consists of a lower and an upper sideband, which couple with the optical cavity and mechanical resonator, and generate the beam splitter and two mode squeezing interactions under the rotating wave approximation. This interaction mechanism modifies the effective susceptibility of the optomechanical cavity and optomechanically induces a four wave mixing process. Strong quantum entanglement can be generated between the signal and four wave mixing fields with an entangled degree over 16 dB in realistic optomechanical systems. The generation scheme of the quantum entanglement is quite robust against thermal mechanical noise, and entanglement above 3 dB can persist at room temperature in the weak coupling regime.