基于自发参量下转换的高效位置-动量纠缠制备  

Efficient Preparation of Position-Momentum Entanglement Based on Spontaneous Parametric Down-Conversion

作　　者：王锴 毛天宇 陈融时 韩飞 赵楠翔 张鑫源 马庆力 徐世龙 胡以华 Wang Kai;Mao Tianyu;Chen Rongshi;Han Fei;Zhao Nanxiang;Zhang Xinyuan;Ma Qingli;Xu Shilong;Hu Yihua(State Key Laboratory of Pulsed Power Laser Technology,Electronic Engineering Institute,National University of Defense Technology,Hefei 230037,Anhui,China;Anhui Province Key Laboratory of Electronic Restriction,Electronic Engineering Institute,National University of Defense Technology,Hefei 230037,Anhui,China)

机构地区：[1]国防科技大学电子对抗学院脉冲功率激光技术国家重点实验室,安徽合肥230037 [2]国防科技大学电子对抗学院电子制约技术安徽省重点实验室,安徽合肥230037

出　　处：《中国激光》2025年第2期262-268,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(12104506,62205372);合肥综合性国家科学中心资助项目(KY23C502);先进激光技术安徽省实验室主任基金(KY22C608);国防科技大学自主创新科学基金(22-ZZCX-07,23-ZZCX-JDZ-46,24-ZZCX-JDZ-43);国防科技大学青年自主创新科学基金(ZK23-45)。

摘　　要：两粒子的位置-动量纠缠对于量子物理基础研究及量子信息处理有着特殊的重要性。传统的位置-动量纠缠制备技术主要基于非线性晶体和原子系统。与非线性晶体相比,原子系统的装置更加复杂,调节难度更大。然而,利用偏硼酸钡(BBO)晶体产生纠缠光子的效率较低,且光路调节难度较大。使用鬼成像和鬼干涉技术在周期极化磷酸氧钛钾(PPKTP)晶体光路中实现了高效率的位置-动量(EPR)纠缠光子产生,并验证了纠缠特性。单个像素点的采样时间为10 s,实验装置设计也相对简便。所研究的纠缠光子源可以为量子成像和超纠缠态制备提供帮助,在量子信息处理和量子通信协议等领域中展现出广阔的应用前景。Objective The position-momentum(EPR)entanglement of two particles is of special importance for fundamental research in quantum physics and quantum information processing.The existing methods for preparing position-momentum entanglement are mainly based on nonlinear crystal and atomic systems.Devices in atomic systems are complex and difficult to adjust,and the efficiency of entangled photons generated byβ-BaB_(2)O_(4)(BBO)crystals is low.In this study,we first use ghost imaging and ghost interference techniques to achieve efficient generation of position-momentum entangled photons in the periodically polarized potassium titanium phosphate(PPKTP)crystal optical path,and verify the entanglement properties.The sampling time for a single pixel is 10 s,and the experimental setup design is relatively simple.The entangled photon source analyzed in this study can provide assistance for quantum imaging and preparation of super-entangled states.It also demonstrates broad application potential in fields such as quantum information processing and quantum communication protocols.The preparation of EPR entanglement is mainly based on nonlinear effects of the medium.The atoms in crystals and cold atomic clusters are almost stationary,making them ideal media for generating position and momentum entangled photons,given that the mass of photon entanglement does not decrease owing to atomic motion.The existing EPR entanglement preparation methods are mainly based on nonlinear crystal and atomic systems,including spontaneous parametric down-conversion(SPDC)effects based on BBO crystals,spontaneous four-wave mixing(SFWM)effects based on cold atomic systems,and spontaneous Raman scattering(SRS)effects.Experiments have found that high-quality entanglement sources can also be prepared based on the SFWM and SRS effects of thermal atomic systems.The characterization of EPR entanglement can be achieved through ghost imaging and ghost interference.The positional uncertainty can be calculated using ghost imaging data whereas the uncertainty

关 键 词：位置-动量纠缠 自发参量下转换 鬼成像 鬼干涉 

分 类 号：O439[机械工程—光学工程]