Quantum squeezing-induced quantum entanglement and EPR steering in a coupled optomechanical system

Area of Science:

• Quantum physics
• Optomechanics
• Nonlinear optics

Background:

• Quantum entanglement and EPR steering are fundamental quantum phenomena.
• Optomechanical systems offer a platform for exploring quantum mechanics.

Purpose of the Study:

• To theoretically investigate quantum squeezing inducing entanglement and EPR steering in a coupled whispering-gallery-mode optomechanical system.
• To explore parameter control over entanglement and steering dynamics.

Main Methods:

• Utilizing a χ(2)-nonlinear resonator pumped under phase matching conditions.
• Analyzing the interplay between the squeezed resonator mode and the mechanical mode.
• Investigating photon-photon entanglement and steering via driving laser amplitude.

Main Results:

• Quantum squeezing in the nonlinear resonator is shown to be crucial for generating strong quantum entanglement and EPR steering.
• Tunable transitions from zero to strong entanglement and one-way to two-way steering are achievable by adjusting system parameters.
• Photon-photon entanglement and steering between resonators can be obtained by modulating the driving laser amplitude.

Conclusions:

• The proposed theoretical framework demonstrates a novel method for generating and controlling quantum entanglement and EPR steering.
• This approach does not require extraordinary squeezed fields, offering practical advantages for quantum technology.
• The system provides a flexible platform for applications leveraging optomechanical and photon-photon entanglement and steering.