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双腔光力学系统中输出光场纠缠特性的研究
引用本文:张秀龙,鲍倩倩,杨明珠,田雪松.双腔光力学系统中输出光场纠缠特性的研究[J].物理学报,2018,67(10):104203-104203.
作者姓名:张秀龙  鲍倩倩  杨明珠  田雪松
作者单位:1. 东北石油大学 电子科学学院, 大庆 163318; 2. 辽宁大学 物理学院, 沈阳 110036; 3. 黑龙江科技大学 理学院, 哈尔滨 150001
基金项目:黑龙江省自然科学基金(批准号:QC2017062)、辽宁省教育厅一般项目(批准号:L2014002)和辽宁大学青年科研基金(批准号:LDQN201430,LDGY201403)资助的课题.
摘    要:腔光力学系统中的光辐射压力可以使系统中的各个子系统之间产生量子纠缠,最近在腔光力学系统中的量子纠缠引起了人们广泛的关注.本文研究了双腔光力系统中关于输出光场之间纠缠的性质,发现:此系统中力学振子的弛豫速率和滤波器带宽以及非相等耦合对输出光场之间纠缠的大小有着非常显著的影响,特别是在相等耦合条件下,输出光场中心频率与光腔本征频率近共振时,滤波器带宽对输出光场纠缠有着显著的抑制作用;但是如果采用非相等耦合,则可以有效抵制滤波器带宽对纠缠的抑制作用,使输出光场纠缠得到大幅提高.研究结果可应用在光力耦合系统中实现量子态转换、量子隐形传态等量子信息处理过程.

关 键 词:腔光力学  输出纠缠  多模光力系统
收稿时间:2017-11-17

Entanglement characteristics of output optical fields in double-cavity optomechanics
Zhang Xiu-Long,Bao Qian-Qian,Yang Ming-Zhu,Tian Xue-Song.Entanglement characteristics of output optical fields in double-cavity optomechanics[J].Acta Physica Sinica,2018,67(10):104203-104203.
Authors:Zhang Xiu-Long  Bao Qian-Qian  Yang Ming-Zhu  Tian Xue-Song
Institution:1. College of Electronic Science, Northeast Petroleum University, Daqing 163318, China; 2. College of Physics, Liaoning University, Shenyang 110036, China; 3. College of Science, Heilongjiang University of Science and Technology, Harbin 150001, China
Abstract:Radiation pressure in an optomechanical system can be used to generate various quantum entanglements between the subsystems. Recently, one paid more attention to the study of quantum entanglement in an optomechanical system. Here in this work, we study the properties of output entanglement between two filtered output optical fields by the logarithmic negativity method in a double-cavity optomechanical system. Our calculations show that the decay rate of the mechanical resonator, the bandwidth of filter function, and non-equal-coupling will evidently affect the value of the output entanglement. In particular, under the parameters of equal-coupling and zero filter bandwidth, the output entanglement in the vicinity of resonant frequency (ω=0 in the rotating frame) will decease with mechanical decay rate increasing. But under the parameters of equal-coupling and non-zero filter bandwidth, the output entanglement will be suppressed if the center frequency of output field is in the vicinity of the resonant frequency. However, the output entanglement can be enhanced if we adopt a non-equal-coupling to counteract the suppression effect of the filter bandwidth. Furthermore, we find that there are three peaks in the whole center frequency domain of the output field if we adopt strong non-equal-coupling. This is because the normal mode of Hamiltonian Hint will split into three normal modes in this case. Our results can also be used in other parametrically coupled three-mode bosonic systems and may be applied to realizing the state transfer process and quantum teleportation in an optomechanical system.
Keywords:cavity-optomechanics  output entanglement  multi-mode optomechanical system
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