Enhancing steady-state entanglement via vacuum-induced emitter–mirror coupling in a hybrid optomechanical system
Enhancing steady-state entanglement via vacuum-induced emitter–mirror coupling in a hybrid optomechanical system
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DOI：
10.1088/0953-4075/49/2/025501
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发表时间：
2016-01
期刊：
影响因子：
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通讯作者：
W. Nie;Ai-xi Chen;Y. Lan;Q. Liao;Shi-Yao Zhu
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文献类型：
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作者：
W. Nie;Ai-xi Chen;Y. Lan;Q. Liao;Shi-Yao Zhu
我们研究了一种混合光机械系统，该系统由标准光机械腔中的量子发射体系综和移动端镜组成，其中镜的运动改变了每个发射体的跃迁速率，从而导致量子发射体的内部状态和机械模式之间的直接耦合。我们分析了光机系统的稳态特性，发现系统的双稳性强烈地依赖于发射极系综与反射镜之间的距离。此外，我们还详细分析了距离和其他系统参数的影响，即，通过考虑机械振子、腔场和辐射子系综的涨落，研究了腔场的有效失谐量、驱动功率、腔场的衰减率、辐射子系综和热声子对稳态纠缠的影响.结果表明，在一定的参数范围内，增加真空诱导的发射极-反射镜耦合可以显著提高系统的稳态纠缠度，这可以通过减小发射极-反射镜距离和适当增加发射极的自由空间自发辐射率来实现.
We investigate a hybrid optomechanical system consisting of an ensemble of quantum emitters inside a standard optomechanical cavity with a moving end mirror, in which the motion of the mirror changes the transition rate of each emitter and therefore leads to a direct coupling between the internal state of the quantum emitter and the mechanical mode. We analyzed the steady-state characteristics of the optomechanical system and found that the bistability of the system depends strongly on the distance between the emitter ensemble and the mirror. Further, we also analyze in detail the influences of the distance and other system parameters, i.e., the effective detunings, the driving power, the decay rates of the cavity, and the emitter ensemble and the thermal phonons on the steady-state entanglement by considering fluctuation of the mechanical oscillator, the cavity field, and the emitter ensemble. It is found that the degree of the steady-state entanglement can be greatly enhanced in a certain range of parameters by increasing the vacuum-induced emitter–mirror coupling, which can be realized by decreasing the emitter–mirror distance and increasing properly the free-space spontaneous emission rate of the emitter.