Phase-controlled asymmetric optomechanical entanglement against optical backscattering

• Published in: Science China. Physics, mechanics & astronomy mechanics & astronomy, 2023-03, Vol.66 (3), p.230312, Article 230312
• Main Authors: Liu, Jing-Xue, Jiao, Ya-Feng, Li, Ying, Xu, Xun-Wei, He, Qiong-Yi, Jing, Hui
• Format: Article
• Language: English
• Subjects: Astronomy; Asymmetry; Backscattering; Classical and Continuum Physics; Gravitational waves; Lasers; Light; Observations and Techniques; Physics; Physics and Astronomy; Quantum entanglement; Quantum physics; Quantum theory; Science
• ISSN: 1674-7348; 1869-1927
• DOI: 10.1007/s11433-022-2043-3

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 a 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 the practical noisy environment, which is crucial in such a wide range of applications as noise-tolerant quantum processing and the backscattering-immune quantum metrology.