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作 者:薛娇阳 邓琦琦 李淑静[1,2] 陈力荣 王海 XUE Jiao-yang;DENG Qi-qi;LI Shu-jing;CHEN Li-rong;WANG Ha(State Key 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;Department of Electronics and Information Technology,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,山西太原030006 [2]山西大学极端光学协同创新中心,山西太原030006 [3]山西大学物理电子工程学院,山西太原030006
出 处:《量子光学学报》2020年第4期350-355,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(11834010,11604191,61805133);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:量子通信网络由量子节点和量子信道构成。在量子节点上进行量子态的操控,其对应的是原子记忆波段;然而原子记忆波段的工作波长在光纤(量子信道)中的传输损耗很大,不利于远距离的信息传输。在本文中,我们选用周期极化铌酸锂波导晶体作为非线性介质,利用差频技术实现了铷原子D1线795 nm波段到1621 nm波段的频率转换,并研究了频率转换效率随实验参数的变化关系。Quantum communication is a new interdisciplinary subject combining classical information theory and quantum mechanics.Its rise makes it possible for quantum network with high efficiency and absolute security.Optical quantum communication,with its high efficiency and absolute security,has become the next generation communication mode to deal.Quantum communication network is composed of quantum nodes and quantum channels.Because the significant losses and decoherence effect of qubits propagating in optical fiber are inevitable,the fidelity of information decreases exponentially with the increase of transmission distance.It is still of a great challenges to realizo in long-distance optical quantum network.In 2001,Duan,Lukin,cirac and zoller proposed a dlcz quantum relay scheme based on atomic ensemble.This scheme combines quantum memory and entanglement swapping in atomic ensemble,which overcomes the problem of exponential loss in optical fiber,and lays a foundation for the study of long-distance quantum communication.One of tough problems in quantum networks is that the generation,storage and manipulation of quantum states are completed in quantum nodes,while the transmission of quantum states is completed in quantum channels,and the manipulation of quantum states in quantum nodes corresponds to the atomic memory band.However,the transmission loss of working wavelength corresponding to atomic memory in optical fiber(quantum channel)is very large,which is not conducive to long-distance information transmission.In order to complete the long distance quantum communication,it is necessary to establish entanglement between two remote quantum nodes.In this paper,we use periodically poled LiNbO3 waveguide crystal as nonlinear medium,and realize the frequency conversion from 795 nm band to 1621 nm band of rubidium atom D1 line by using difference frequency technology.Therefore the signal output from atomic memory should be first converted to the communication band in order to realize low loss transmission in optical fiber
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