Multi-copy entanglement purification with practical spontaneous parametric down conversion sources  

作　　者：张帅帅 祁舒 周澜 盛宇波 

机构地区：[1]Key Laboratory of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education,Nanjing University of Posts and Telecommunications [2]Bell Honors School,Nanjing University of Posts and Telecommunications [3]College of Mathematics & Physics,Nanjing University of Posts and Telecommunications

出　　处：《Chinese Physics B》2017年第6期53-60,共8页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11474168 and 61401222);the Natural Science Foundation of Jiangsu Province,China(Grant No.BK20151502);the Qing Lan Project in Jiangsu Province,China;a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions,China

摘　　要：Entanglement purification is to distill the high quality entanglement from the low quality entanglement with local operations and classical communications. It is one of the key technologies in long-distance quantum communication. We discuss an entanglement purification protocol（EPP） with spontaneous parametric down conversion（SPDC） sources, in contrast to previous EPP with multi-copy mixed states, which requires ideal entanglement sources. We show that the SPDC source is not an obstacle for purification, but can benefit the fidelity of the purified mixed state. This EPP works for linear optics and is feasible in current experiment technology.Entanglement purification is to distill the high quality entanglement from the low quality entanglement with local operations and classical communications. It is one of the key technologies in long-distance quantum communication. We discuss an entanglement purification protocol（EPP） with spontaneous parametric down conversion（SPDC） sources, in contrast to previous EPP with multi-copy mixed states, which requires ideal entanglement sources. We show that the SPDC source is not an obstacle for purification, but can benefit the fidelity of the purified mixed state. This EPP works for linear optics and is feasible in current experiment technology.

关 键 词：quantum communication ENTANGLEMENT entanglement purification 

分 类 号：O413[理学—理论物理] TN918[理学—物理]