光学腔增强光与冷原子耦合及自旋波读出效率的实验研究  

Experimental Study on Optical Cavity Enhanced Coupling between Light and Cold Atoms and Spin Wave Readout Efficiency

作　　者：王圣智 王敏杰 马腾飞 李淑静[1,2] 徐忠孝 王海[1,2] WANG Sheng-zhi;WANG Min-jie;MA Teng-fei;LI Shu-jing;XU Zhong-xiao;WANG Hai(State Key of Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,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,太原山西030006 [2]山西大学极端光学协同创新中心,太原山西030006

出　　处：《量子光学学报》2021年第2期117-122,共6页Journal of Quantum Optics

基　　金：国家重点研发计划(2016YFA0301402);国家自然科学基金(11475109,11604191,11974228);山西省“1331工程”重点学科建设计划经费资助;山西省应用基础研究计划(201601D202007)。

摘　　要：在^(87)Rb冷原子系综中,通过自发拉曼散射过程产生了光子与原子自旋波的关联对。利用光学腔增强光与原子的相互作用,使光子和原子自旋波关联对的产生率增加了3.8倍。同时,我们也研究了光学腔对原子自旋波读出效率的影响。结果表明,腔使自旋波的读出效率提高了1.5倍。本文的研究结果为下一步产生高恢复效率的光与原子量子纠缠提供了实验基础。The distribution of quantum States over long distances plays an important role in quantum communication and quantum network.The studies of effectively realizing quantum memory have evoked considerable interest in the scientific community.The DLCZ quantum repeaters relying on spontaneous Raman scattering has been demonstrated as an effective approach to realize long-distance quantum memory.Large multimode capacity,long lifetime and high storage efficiency are three important indicators to achieve high quantum storage.To promote storage efficiency of quantum storage,efforts have been devoted by increasing the optical thickness,using the cavity enhanced storage as well as optimizing the optical pulse shape and so on.Among them,optical cavity possesses the advantage of enhancing interaction force and suppressing spontaneous emission,and thus has evoked considerable interest in quantum memory,some recent research has demonstrated that the efficiency of quantum storage can be improved by using optical cavity in quantum storage based on cold atomic ensemble.However,the storage efficiency in long-lived storage in quantum storage still needs further improving.In this paper,the correlated pairs of photons and atomic spin waves are generated by spontaneous Raman scattering process in the ^(87)Rb cold atom ensemble.Based on optical cavity to enhance the interaction between light and atom,the generation rate of the correlated pairs of photons and atomic spin waves has been increased by 3.8 times.Meanwhile,the effects of optical cavity on the read field efficiency of atomic spin wave are studied.The results show that the read efficiency of spin wave has been increased by 1.5 times,which is more than that of without cavity,and its corresponding intrinsic read efficiency is 40.6%.The results of this paper provide an experimental basis for the further generation of high recovery efficiency quantum entanglement of photon-atom with high recovery efficiency.

关 键 词：冷原子系综 自发拉曼散射 光学环形腔 

分 类 号：O431[机械工程—光学工程]