Efficient entanglement purification in quantum repeaters

doi:10.1088/1674-1056/21/3/030307

中国物理B ›› 2012, Vol. 21 ›› Issue (3): 30307-030307.doi: 10.1088/1674-1056/21/3/030307

盛宇波¹ ² ³,周澜⁴,程维文¹ ² ³,巩龙龑¹ ² ³,赵生妹¹ ³,郑宝玉¹ ³

收稿日期:2011-10-31 修回日期:2011-11-15 出版日期:2012-02-15 发布日期:2012-02-15
通讯作者: 盛宇波,shengyb@njupt.edu.cn E-mail:shengyb@njupt.edu.cn

Efficient entanglement purification in quantum repeaters

Sheng Yu-Bo(盛宇波)^a)b)c)†, Zhou Lan(周澜)^d), Cheng Wei-Wen(程维文)^a)b)c), Gong Long-Yan(巩龙龑)^a)b)c), Zhao Sheng-Mei(赵生妹)^a)c), and Zheng Bao-Yu(郑宝玉)^a)c)

a. Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;
b. College of Telecommunications & Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;
c. Key Laboratory of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;
d. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2011-10-31 Revised:2011-11-15 Online:2012-02-15 Published:2012-02-15
Contact: Sheng Yu-Bo,shengyb@njupt.edu.cn E-mail:shengyb@njupt.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11104159 and 10904074), the Scientific Research Foundation of Nanjing University of Posts and Telecommunications, China (Grant No. NY211008), the University Natural Science Research Foundation of Jiangsu Province, China (Grant No. 11KJA510002), the Open Research Fund of Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) of Ministry of Education, China, and the Priority Academic Program Development Fund of Jiangsu Higher Education Institutions, China.

摘要/Abstract

Abstract: We present an efficient entanglement purification protocol (EPP) with controlled-not (CNOT) gates and linear optics. With the CNOT gates, our EPP can reach a higher fidelity than the conventional one. Moreover, it does not require the fidelity of the initial mixed state to satisfy F>1/2. If the initial state is not entangled, it still can be purified. With the linear optics, this protocol can get pure maximally entangled pairs with some probabilities. Meanwhile, it can be used to purify the entanglement between the atomic ensembles in distant locations. This protocol may be useful in long-distance quantum communication.

Key words: quantum communication, entanglement, entanglement purification, quantum repeater

中图分类号: (Quantum cryptography and communication security)

03.67.Dd

03.67.Hk (Quantum communication) 03.65.Ud (Entanglement and quantum nonlocality)

盛宇波, 周澜, 程维文, 巩龙龑, 赵生妹, 郑宝玉. [J]. 中国物理B, 2012, 21(3): 30307-030307.

Sheng Yu-Bo(盛宇波), Zhou Lan(周澜), Cheng Wei-Wen(程维文), Gong Long-Yan(巩龙龑), Zhao Sheng-Mei(赵生妹), and Zheng Bao-Yu(郑宝玉) . Efficient entanglement purification in quantum repeaters[J]. Chin. Phys. B, 2012, 21(3): 30307-030307.

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Efficient entanglement purification in quantum repeaters

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