Nearly invariant boundary entanglement in optomechanical systems  

作　　者：Shi-Wei Cui Zhi-Jiao Deng Chun-Wang Wu Qing-Xia Meng 崔世威;邓志姣;吴春旺;孟庆霞(Department of Physics,College of Liberal Arts and Sciences,National University of Defense Technology,Changsha 410073,China;Interdisciplinary Center for Quantum Information,National University of Defense Technology,Changsha 410073,China;Northwest Institute of Nuclear Technology,Xi’an 710024,China)

机构地区：[1]Department of Physics,College of Liberal Arts and Sciences,National University of Defense Technology,Changsha 410073,China [2]Interdisciplinary Center for Quantum Information,National University of Defense Technology,Changsha 410073,China [3]Northwest Institute of Nuclear Technology,Xi’an 710024,China

出　　处：《Chinese Physics B》2021年第11期253-260,共8页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11574398,11904402,12074433,and 12004430);the National Basic Research Program of China(Grant No.2016YFA0301903).

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 101023838(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.

关 键 词：boundary entanglement optomechanical system 

分 类 号：O431.2[机械工程—光学工程]