Efficient entanglement purification in quantum repeaters |
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| Authors: | Sheng Yu-Bo Zhou Lan Cheng Wei-Wen Gong Long-Yan Zhao Sheng-Mei Zheng Bao-Yu |
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| Affiliation: | Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;College of Telecommunications & Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;Key Laboratory of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;College of Telecommunications & Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;Key Laboratory of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;College of Telecommunications & Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;Key Laboratory of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;Key Laboratory of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;Key Laboratory of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education, Nanjing University of Posts and Telecommunications, Nanjing 210003, China |
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| 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. |
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| Keywords: | quantum communication entanglement entanglement purification quantum repeater |
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