Phase-controlled asymmetric optomechanical entanglement against optical backscattering

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