高效率时间复用Duan-Lukin-Cirac-Zoller存储方案的实验研究  

Experimental study of efficient temporal-multimode Duan-Lukin-Cirac-Zoller storage scheme

作　　者：温亚飞 庄园园 王志强 高士回 Wen Ya-Fei;Zhuang Yuan-Yuan;Wang Zhi-Qiang;Gao Shi-Hui(Department of Physics,Taiyuan Normal University,Jinzhong 030619,China;College of Computer Science and Technology,Taiyuan Normal University,Jinzhong 030619,China;Institute of Computational and Applied Physics,Taiyuan Normal University,Jinzhong 030619,China)

机构地区：[1]太原师范学院物理系,晋中030619 [2]太原师范学院计算机科学与技术学院,晋中030619 [3]太原师范学院计算物理与应用物理研究所,晋中030619

出　　处：《物理学报》2024年第18期16-23,共8页Acta Physica Sinica

基　　金：山西省自然科学基金(批准号:20210302124265);山西省高等学校科技创新计划科研项目(批准号:2021L426,2021L441)资助的课题。

摘　　要：大规模广域量子网络的构建需要在量子节点之间进行纠缠交换及量子中继等过程,基于自发拉曼散射过程在冷原子中制备空间复用、时间复用以及多模式复用的光与原子纠缠界面为实现量子中继提供有效技术途径,其中读出效率的高低具有至关重要的作用.通过设计可扩展型脉冲光制备技术及能级的合理选择,本文构建了具有高效率的六路时间复用的光与原子纠缠源.实现纠缠源纠缠产生概率5.83倍的增强,同时读出效率约38%,对应Bell参数约为2.35.本研究成果为长距离量子通信及广域大规模量子网络构建提供有效资源及技术支撑.Quantum interfaces that generate entanglement or correlations between a photon and an atomic memory are fundamental building blocks in quantum repeater research.Temporal,spatial,and spectral multiplexed atom-photon entanglement interfaces in cold atomic systems based on spontaneous Raman scattering processes,present an effective technical approach to realizing quantum repeaters.Compared with the other schemes,temporal-multiplexing schemes are particularly attractive since they repeatedly use the same physical process.In these schemes,readout efficiency plays a crucial role.Theoretical models indicate that even if the readout efficiency is increased by 1%,the probability of long-distance entanglement distribution will be increased by 7%-18%.However,current implementation of temporal-multimode quantum memory often suffers low readout efficiency unless an optical cavity or an atomic ensemble with a large optical-depth is adopted.In this study,we solve this challenge by using the expandable pulsed light fabricating technology and carefully selecting energy level transitions,so as to develop an efficient temporal-multiplexed quantum source.Our approach involves applying a train of write laser pulses to an atomic ensemble from different directions,thereby creating spin-wave memories and Stokes-photon emissions.We design an expandable pulsed light fabrication device based on the principle of optical path reversibility,allowing a writing laser beam to pass through an acousto-optic modulator(AOM)network in two different directions.This setup enables precise control over the directions of the write pulse train through real-time manipulation of the field-programmable gate array(FPGA)and the diffraction order of the AOMs.In our experiment,we prepare six pairs of modes.After detecting Stokes photons during the experimental cycle,the FPGA outputs a feedforward signal after a specified storage time,triggering the application of a corresponding reading pulse from the read AOM network to the atomic ensemble,thereby generating an

关 键 词：高效率 时间复用存储 能级跃迁选择 脉冲光制备技术 

分 类 号：O413[理学—理论物理]