相敏操控对制备低频双模正交压缩真空态光场的影响  

Effect of phase-sensitive manipulations on generation of lowfrequency two-mode orthogonal squeezed vacuum states

作　　者：吴炜 赵豪 冯晋霞[1,3] †李俊 李渊骥 张宽收[1,3,1] Wu Wei;Zhao Hao;Feng Jin-Xia;Li Jun;Li Yuan-Ji;Zhang Kuan-Shou(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China;College of Physics and Electronic Science,Hubei Normal University,Huangshi 435002,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China;Avic Xi’an Flight Automatic Control Research Institue,Xi’an 710076,China)

机构地区：[1]山西大学光电研究所,量子光学与光量子器件国家重点实验室,太原030006 [2]湖北师范大学物理与电子科学学院,黄石435002 [3]山西大学,极端光学协同创新中心,太原030006 [4]中国航空工业集团公司西安飞行自动控制研究所,西安710076

出　　处：《物理学报》2024年第5期117-126,共10页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:62175135);山西省基础研究计划(批准号:202103021224025)资助的课题.

摘　　要：本文提出了利用单边带移频光实现非简并光学参量放大器相敏操控的方案,实验研究了在对非简并光学参量放大器相敏操控过程中,单边带移频光注入的方案和信号光注入的方案对产生的低频双模正交压缩真空态光场的影响.实验结果表明,信号光注入非简并光学参量放大器实现相敏操控过程中,压缩真空态的压缩度随着注入信号光场功率的增加不断减小直至消失.而在单边带移频光注入非简并光学参量放大器实现相敏操控过程中,正交振幅和正交位相压缩真空态的压缩度对注入移频光场的功率变化都不敏感,压缩度几乎不变.采用单边带移频光方案实现稳定的相敏操控,非简并光学参量放大器运转于相敏放大状态达30 min,获得了稳定输出的低频双模正交压缩真空态光场,在傅里叶分析频率为200 kHz测量的正交振幅分量的压缩度为(4.1±0.1)dB,正交位相分量的压缩度为(4.0±0.2)dB.Two-mode orthogonal squeezed vacuum states are an important quantum resource for quantum communication,quantum computing,quantum simulation,quantum precision measurement and sensing.It is essential to obtain stable two-mode orthogonal squeezed vacuum states in a low frequency range and compact configurations for practical applications,especially in quantum precision measurement and sensing.Two-mode orthogonal squeezed vacuum states are commonly produced via a subthreshold nondegenerate optical parametric amplifier(NOPA)in a continuous variable system.However,it is a difficult problem that the subthreshold NOPA cavity is phase sensitive manipulated to obtain stable squeezed vacuum states.Previous signal light injecting scheme relies on an injection of a weak light field into the subthreshold NOPA for phase sensitive manipulation.The injected signal light has the same frequency as the generated squeezed vacuum state.Thereby even the weakest injected signal light can introduce large amounts of excessive noise at low frequencies and the squeezing degree of two-mode squeezed vacuum states will be reduced or squeezing cannot be achieved.In this paper,a single sideband frequency shifted light injecting scheme is proposed for phase sensitive manipulation of NOPA.The comparison between the single sideband frequency shifted light injecting scheme and the signal light injecting scheme for realization of phase sensitive manipulation of NOPA is conducted.The effects of the two schemes on the generation of the low-frequency two-mode orthogonal squeezed vacuum state light field are investigated experimentally.The experimental results show that in the signal light injecting scheme for phase sensitive manipulation,the squeezing degree of the two-mode orthogonal squeezed vacuum state continuously decreases until it disappears as the power of injected signal light increases.In the process of phase sensitive manipulation of NOPA by using the single sideband frequency shifted light injecting scheme,the squeezing degree of the two-mod

关 键 词：双模正交压缩真空态 光学参量放大器 相敏操控 

分 类 号：O431.2[机械工程—光学工程]