Phase-controlled asymmetric optomechanical entanglement against optical backscattering

TL;DR

This paper demonstrates a phase-controlled method to switch and enhance optomechanical entanglement in whispering-gallery-mode resonators, improving robustness against optical backscattering for quantum applications.

Contribution

It introduces a novel phase-tuning technique to control asymmetric optomechanical entanglement, offering protection against optical backscattering in quantum devices.

Findings

Entanglement can be coherently switched via phase tuning.

Asymmetric configurations enhance entanglement robustness.

Method improves quantum device performance in noisy environments.

Abstract

Quantum entanglement plays a key role in both understanding the fundamental aspects of quantum physics and realizing various quantum devices for practical applications. Here we propose how to achieve coherent switch of optomechanical entanglement in an optical whispering-gallery-mode resonator, by tuning the phase difference of the driving lasers. We find that the optomechanical entanglement and the associated two-mode quantum squeezing can be well tuned in a highly asymmetric way, providing an efficient way to protect and enhance quantum entanglement against optical backscattering, in comparison with conventional symmetric devices. Our findings shed a new light on improving the performance of various quantum devices in practical noisy environment, which is crucial in such a wide range of applications as noise-tolerant quantum processing and the backscattering-immune quantum metrology.