Fast multi-copy entanglement purification with linear optics  

作　　者：蔡春 周澜 盛宇波 

机构地区：[1]Key Laboratory of Broadband Wireless Communication and Sensor Network Technology, Ministry of Education,Nanjing University of Posts and Telecommunications [2]Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications [3]College of Mathematics and Physics, Nanjing University of Posts and Telecommunications

出　　处：《Chinese Physics B》2015年第12期232-237,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11474168 and 61401222);the Qing Lan Project of Jiangsu Province;China;the STITP Project in Nanjing University of Posts and Telecommunications;the Natural Science Foundation of Jiangsu Province;China(Grant No.BK20151502);the Natural Science Foundation of the Jiangsu Higher Education Institutions(Grant No.15KJA120002);the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions;China

摘　　要：We describe an entanglement purification protocol for a polarization Bell state. Different from the previous protocols,it does not require the controlled-not gate, and only uses linear optical elements to complete the task. This protocol requires multi-copy degraded mixed states, which can make this protocol obtain a high fidelity in one purification step. It can also be extended to purify the multi-photon Greenberger–Horne–Zeilinger（GHZ） state. This protocol may be useful in future long-distance communication.We describe an entanglement purification protocol for a polarization Bell state. Different from the previous protocols,it does not require the controlled-not gate, and only uses linear optical elements to complete the task. This protocol requires multi-copy degraded mixed states, which can make this protocol obtain a high fidelity in one purification step. It can also be extended to purify the multi-photon Greenberger–Horne–Zeilinger（GHZ） state. This protocol may be useful in future long-distance communication.

关 键 词：quantum computation entanglement purification ENTANGLEMENT 

分 类 号：O413.1[理学—理论物理]