基于级联四波混频过程产生四模簇态  

Generation of four-mode cluster states based on cascade four-wave mixing process

作　　者：董安琪 张凯 荆杰泰 刘伍明[4,5,6] Dong An-Qi;Zhang Kai;Jing Jie-Tai;Liu Wu-Ming(State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200062,China;Center for Excellence in Ultra-intense Laser Science,CAS,Shanghai 201800,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[1]华东师范大学精密光谱科学与技术国家重点实验室,上海200062 [2]中国科学院超强激光科学卓越创新中心,上海201800 [3]山西大学极端光学协同创新中心,太原030006 [4]中国科学院物理研究所北京凝聚态物理国家研究中心,北京100190 [5]中国科学院大学物理科学学院,北京100190 [6]松山湖材料实验室,东莞523808

出　　处：《物理学报》2022年第16期47-55,共9页Acta Physica Sinica

基　　金：上海市教委创新计划(批准号:2021-01-07-00-08-E00100);上海市教委基础研究项目(批准号:20JC1416100);国家自然科学基金(批准号:11874155,91436211,11374104,12174110);上海市自然科学基金(批准号:17ZR1442900);闵行领军人才(批准号:201971);上海市科技创新行动计划(批准号:17JC1400401);上海青年科技英才扬帆计划(批准号:21YF1410800);国家重点基础研究发展计划(批准号:2016YFA0302103);上海市市级科技重大专项(批准号:2019SHZDZX01);高等学校学科创新引智计划(批准号:B12024);中国博士后科学基金(批准号:2020M681224)资助的课题。

摘　　要：簇态是量子计算和量子信息处理的重要资源,因其具有独特的纠缠性质和丰富的结构而受到广泛的关注.本文从理论上提出一种基于级联四波混频过程产生四模纠缠态的方案,利用部分转置正定判据和本征模分解研究其内部纠缠特性.此外,通过调控平衡零拍探测的相对相位和后处理噪声信号,将输出的纠缠态重构优化,最终生成三种不同结构的四模簇态.该方法可以有效地减少在有限的压缩条件下产生簇态而引入的额外噪声.本文理论结果为基于原子系综四波混频过程产生可扩展的连续变量簇态提供可靠方案.As a crucial quantum resource for quantum computing and quantum information processing,cluster state has attracted extensive attention due to its unique entanglement properties and rich structures.In this work,we theoretically propose a scheme for generating four-mode entangled states based on cascaded four-wave mixing(FWM)process.The internal entanglement characteristics are studied by using the positivity under partial transposition criterion and eigenmode decomposition.In addition,the output entangled states are reconstructed and optimized by adjusting the relative phase of balanced homodyne detection and postprocessing the signal noise,and finally three four-mode cluster states with different structures are generated.Such a method can effectively reduce the excess noise induced by finite squeezing.Our theoretical results provide a reliable way of generating scalable continuous variable cluster states based on FWM process in atomic ensemble.

关 键 词：四波混频 本征模 簇态 

分 类 号：O413[理学—理论物理]