相干反馈的级联简并光学参量放大器量子特性研究  

The Study of Quantum Characteristics from a Coherent Feedback Controlled Cascaded Degenerated Optical Parametric Amplifier

作　　者：黄东海 付佳佳 卢建刚 梁文娟 亢中苗 韩亚帅 刘云 HUANG Donghai;FU Jiajia;LU Jiangang;LIANG Wenjuan;KANG Zhongmiao;HAN Yashuai;LIU Yun(China Southern Power Grid Power Dispatch Control Center,Guangzhou 510000,China;Anhui Quantum Security Engineering Technology Research Center,Wuhu 241000,China)

机构地区：[1]广东电网有限责任公司电力调度控制中心,广东广州510000 [2]安徽省量子安全工程技术研究中心,安徽芜湖241000

出　　处：《量子光学学报》2025年第1期1-8,共8页Journal of Quantum Optics

基　　金：国家自然科学基金(12104013);南方电网科技项目(036000KK52222047(GDK JXM20222494))。

摘　　要：简并光学参量放大器是实验制备压缩态光场的理想方案之一,提升其量子特性对于压缩态光场在量子信息领域应用具有重要意义。本论文讨论了一种相干反馈的级联简并光学参量放大器,其利用分束器作为反馈控制器,将级联简并光学参量放大器输出的压缩态光场部分反馈回输入端口。基于光学参量放大器理论模型和分束器模型,获得了其输出压缩态光场噪声表达式,基于此研究了其输出光场压缩特性随系统物理参数的依赖关系。研究发现,在整数倍π的反馈相位下和特定的反馈强度范围内,相干反馈可进一步提升级联简并光学参量放大器输出光场的量子压缩特性。本论文研究成果可为短波长压缩态光场压缩度提升提供理论参考,为其在量子通信和量子信息领域应用奠定基础。Objective The squeezed states can not only verify the fundamental principles of quantum physics,but also have important applications in the field of quantum information processing.In the field of quantum communications,the speed and fidelity of communication depend on the squeezing degree of the squeezed states.A degenerated optical parametric amplifier(DOPA)is efficient approach on the production of the squeezed states.In the paper,a coherent feedback controlled cascaded DOPA on the squeezing enhancement is discussed.Methods Base on quantum Langevin equation,the input-output relation of the quadratures noise of the output field can be obtained.The output of the first DOPA is seeded to the second DOPA.Then,the noise of the light from the second DOPA can also be obtained.Further,the output of the second DOPA is partially feed back to the input of the first DOPA through a beam spliter.Based on the inputoutput relation of the beam splitter,the noise formula of the coherent feedback controlled cascaded DOPA is acquired.Results and Discussions Based on the noise formula,the dependence of squeezing from the coherent feedback controlled cascaded DOPA on feedback intensity,the phase delay of the feedback loop,pump parameter,the propagation loss of the feedback loop is numerically simulated and presented in the paper.These results show that the squeezing can be significantly enhanced with a certain parameterrange.Conclusions This paper discusses a cascaded DOPA with coherent feedback,which uses a beam spliter as a feedback controller to feed the squeezed light output from the cascaded DOPA back to the input port.Our research results show that within a certain range of feedback intensity and specific feedback phase,coherent feedback can further enhance the quantum squeezing characteristics of the output light field from a cascaded DOPA.The paper has also studied the dependence of squeezing enhancement effect on system physical parameters.The research results of this paper can provide theoretical reference for improving the

关 键 词：压缩态 简并光学参量放大器 相干反馈 

分 类 号：TN722.32[电子电信—电路与系统]