中国物理B ›› 2021, Vol. 30 ›› Issue (11): 110311-110311.doi: 10.1088/1674-1056/ac16ca
Shi-Wei Cui(崔世威)1,2, Zhi-Jiao Deng(邓志姣)1,2,†, Chun-Wang Wu(吴春旺)1,2, and Qing-Xia Meng(孟庆霞)3
Shi-Wei Cui(崔世威)1,2, Zhi-Jiao Deng(邓志姣)1,2,†, Chun-Wang Wu(吴春旺)1,2, and Qing-Xia Meng(孟庆霞)3
摘要: In order to understand our previous numerical finding that steady-state entanglement along the instability boundary remains unchanged in a three-mode optomechanical system [Phys. Rev. A 101 023838 (2020)], we investigate in detail the boundary entanglement in a simpler two-mode optomechanical system. Studies show that both the mechanism to generate entanglement and the parameter dependence of boundary entanglement are quite similar in these two models. Therefore, the two-mode system has captured the main features in the three-mode system. With the help of analytical calculations and discussing in a much bigger parameter interval, we find that the unchanging behavior previously discovered is actually an extremely slow changing behavior of the boundary entanglement function, and most importantly, this nearly invariant boundary entanglement is a general phenomenon via parametric down conversion process in the weak dissipation regime. This is by itself interesting as threshold quantum signatures in optomechanical phonon lasers, or may have potential value in related applications based on boundary quantum properties.
中图分类号: (Entanglement and quantum nonlocality)