摘要
光学非互易性对建立量子网络和现代通讯技术都是不可或缺的.本文研究了双腔光力学系统在蓝失谐驱动下如何实现完美的光学非互易性.研究发现此系统中的光学非互易性来源于系统中的光力相互作用和腔模线性耦合相互作用之间的量子干涉效应.在应用光力学输入输出关系得出输出光场表达式后,给出了在此系统中实现完美光学非互易性的条件以及影响非互易谱线宽度的因素.另外还发现当系统参数(耗散速率)一定时,可以存在两套耦合强度来实现完美的光学非互易性.最后利用劳斯-霍尔维茨(Routh-Hurwitz)稳定性判据给出了系统的稳定条件.
Radiation pressure in an optomechanical system can be used to generate various quantum phenomena.Recently,one paid more attention to the study of optical nonreciprocity in an optomechanical system,and nonreciprocal devices are indispensable for building quantum networks and ubiquitous in modern communication technology.Here in this work,we study how to realize the perfect optical nonreciprocity in a two-cavity optomechanical system with blue-detuned driving.Our calculations show that the optical nonreciprocity comes from the quantum interference of signal transmission between two possible paths corresponding to the two interactions in this system,i.e.optomechanical interaction and linearly-coupled interaction.According to the standard input-output relation of optical field in cavity optomechanics,we obtain the expression of output optical field,from which we can derive the essential conditions to achieve the perfect optical nonreciprocity,and find there are two sets of coupling strengths both of which can realize the perfect optical nonreciprocal transmission.Because the system is driven by blue-detuned driving,the system is stable only under some conditions which we can obtain according to the Routh-Hurwitz criterion.Due to the bluedetuned driving,there will be transmission gain(transmission amplitude is greater than 1)in the nonreciprocal transmission spectrum.We also find that the bandwidth of nonreciprocal transmission spectrum is in proportion to mechanical decay rate if mechanical decay rate is much less than the cavity decay rate.In other words,in a realistic optomechanical parameter regime,where mechanical decay rate is much less than cavity decay rate,the bandwidth of nonreciprocal transmission spectrum is very narrow.Our results can also be applied to other parametrically coupled three-mode bosonic systems and may be used to realize the state transfer process and optical nonreciprocal transmission in an optomechanical system.
作者
张利巍
李贤丽
杨柳
Zhang Li-Wei;Li Xian-Li;Yang Liu(College of Electronic Science, Northeast Petroleum University, Daqing 163318, China;College of Automation, Harbin Engineering University, Harbin 150001, China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2019年第17期84-91,共8页
Acta Physica Sinica
基金
国家自然科学基金(批准号:41472126,11804066)
中国博士后科学基金(批准号:2018M630337)
中央高校基本科研业务费(批准号：3072019CFM0405)
黑龙江省自然科学基金(批准号:LH2019A005)
黑龙江省博士后基金(批准号:LBH-Z18062)资助的课题~~
关键词
腔光力学
光学非互易性
光频隔离器
cavity optomechanics
optical nonreciprocity
optical isolator
