Author Affiliations
Abstract
1 Key Laboratory of Weak-Light Nonlinear Photonics and School of Physics, Nankai University, Tianjin 300071, China
2 Laboratory of Infrared Materials and Devices, Research Institute of Advanced Technologies, Ningbo University, Ningbo 315211, China
3 Laser Physics Center, Research School of Physics and Engineering, Australian National University, Canberra, ACT 2601, Australia
4 National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
5 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
Reliable generation of single photons is of key importance for fundamental physical experiments and quantum protocols. The periodically poled lithium niobate (LN) waveguide has shown promise for an integrated quantum source due to its large spectral tunability and high efficiency, benefiting from the quasi-phase-matching. Here we demonstrate photon-pair sources based on an LN waveguide periodically poled by a tightly focused femtosecond laser beam. The pair coincidence rate reaches ∼8000 counts per second for average pump power of 3.2 mW (peak power is 2.9 kW). Our results prove the possibility of application of the nonlinear photonics structure fabricated by femtosecond laser to the integrated quantum source. This method can be extended to three-dimensional domain structures, which provide a potential platform for steering the spatial degree of freedom of the entangled two-photon states.
photon pair spontaneous parametric downconversion femtosecond laser lithium niobate waveguide quasi-phase matching Chinese Optics Letters
2023, 21(4): 042701
1 苏州大学 江苏 苏州 215006
2 上海航天电子技术研究所, 上海 201109
量子微波兼具量子信号的量子特性以及微波频段信号的中远距离传播的能力, 在通信、雷达、导航和定位等诸多方面具有广阔的应用前景。本文针对目前在量子微波接收方面的研究相对较少的现状, 总结和分析了量子微波的特性及其接收方法。首先, 介绍微波单光子、纠缠微波光子对以及压缩态和纠缠态微波场的特性和制备方法; 然后, 重点梳理和总结量子微波在量子雷达以及相关物理系统中的接收方法、检测方法、和研究现状; 最后, 指出量子微波接收技术中存在接收端探测信号较弱、微波频段量子纠缠态检测技术不够成熟, 以及量子检测算符有待进一步最优化等问题。针对这些问题, 梳理了几种降低接收端的噪声, 提高探测信号的信噪比, 以及基于纠缠见证的路径纠缠微波检测方案, 从而完成了量子微波从制备到接收的一个完整链路的梳理工作, 希望能为量子微波发射和接收系统技术的发展提供一些参考。
量子微波 量子微波雷达 回波接收 微波单光子 纠缠光子对 压缩态 纠缠态微波场 quantum microwave quantum microwave radar echo receiving single microwave photon entangled microwave photon pair squeezed state entangled state microwave fields
1 中国人民解放军陆军工程大学研究生院, 江苏 南京 210000
2 中国人民解放军军事科学院系统工程研究院, 北京 100071
硅基微环腔的结构参数、半导体特性和工艺形貌会对相关光子对输出重复频率产生重要影响。将晶体硅非线性损耗计入输出重复频率的仿真计算,推导出全通型硅基微环腔自发四波混频效应模型,并利用该模型研究了全通型硅基微环腔品质因数、微环腔半径、晶体硅自由载流子寿命等参数对输出重复频率的影响。结果表明,当外品质因数取值5×104, 抽运功率达到15 mW且继续升高时,输出重复频率反而降低;理想情况下微环腔半径越小,输出重复频率越高;对硅基微环腔相关光子对光源而言,提高输出重复频率的首选方案是降低自由载流子寿命。
微纳光学 硅基微环腔 自发四波混频效应 相关光子对光源 品质因数 micro-nano optics silicon micro-ring resonators spontaneous four-wave mixing effect correlated photon-pair sources quality factor
Author Affiliations
Abstract
1 Biomedical Engineering Research Center, Chang Gung University, Taoyuan 333, China
2 Graduate Institute of Electro-Optical Engineering, Chang Gung University, Taoyuan 333, China
3 Institute of Chemistry, Academic Sinica, Nankang, Taipei 115, China
4 Ph.D Program of Biomedical Engineering, Chang Gung University, Taoyuan 333, China
5 Department of Mechanics, Ming Chi University of Technology, New Taipei 243, China
We propose a novel optical method for glucose measurement based on diffuse photon-pair density wave (DPPDW) in a multiple scattering medium (MSM) where the light scattering of photon-pair is induced by refractive index mismatch between scatters and phantom solution. Experi-mentally, the DPPDW propagates in MSM via a two-frequency laser (TFL) beam wherein highly correlated pairs of linear polarized photons are generated. The reduced scattering coefficient 0 2s and absorption coefficient 2a of DPPDW are measured simultaneously in terms of the amplitude and phase measurements of the detected heterodyne signal under arrangement at different dis-tances between the source and detection fibers in MSM. The results show that the sensitivity of glucose detection via glucose-induced change of reduced scattering coefficient ( 0 2s) is 0.049% mM 1 in a 1% intralipid solution. In addition, the linear range of 0 2s vs glucose concentration implies that this DPPDW method can be used to monitor glucose concentration continuously and noninvasively subcutaneously.
Diffuse photon-pair density wave glucose multiple scattering polarization gating spatial coherence gating Journal of Innovative Optical Health Sciences
2017, 10(1): 1650032
美国贝尔实验室, 阿尔卡特-朗讯, 新泽西州 08358, 美国
综述介绍基于光纤四波混频效应的一些参量器件(放大器、频率转换器、相位共轭器等)的物理特性和工作性能;以及基于这些参量器件的新应用,比如可调谐辐射产生、相位敏感放大器、基于频率转换和色散的缓存以及实时采样等;最后就量子信息实验中的光子产生和频率转换等方面进行一些介绍。
光通信 参量过程 四波混频 放大器 频率转换 光缓冲 频闪观测仪 光子对产生 optical communication parametric process four wave mixing amplifier frequency convert optical buffering stroboscopic photon pair generation
中国科学技术大学 中国科学院量子信息重点实验室, 合肥 230026
提出了一种基于PPKTP波导利用自发参量产生多通道纠缠光子对的方案.计算在使用脉冲, 连续激光, Ⅰ型、Ⅱ型相位匹配这些不同条件下, 同时产生位于通信波段的多通道纠缠光子对的特性.结果显示该方案能够为量子密钥分配网络提供更为高效易行的方案.
激光 自发参量下转换 光子对 Laser PPKTP PPKTP Photon pair SPDC
