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Lower bound for the security of differential phase shift quantum key distribution against a one-pulse-attack |
| Li Hong-Wei(李宏伟)a)b), Yin Zhen-Qiang(银振强)a)†, Wang Shuang(王双)a),Bao Wan-Su(鲍皖苏)b), Guo Guang-Can(郭光灿)a), and Han Zheng-Fu(韩正甫)a)‡ |
| a Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China; b Electronic Technology Institute, Information Engineer University, Zhengzhou 450004, China |
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Abstract Quantum key distribution is the art of sharing secret keys between two distant parties, and has attracted a lot of attention due to its unconditional security. Compared with other quantum key distribution protocols, the differential phase shift quantum key distribution protocol has higher efficiency and simpler apparatus. Unfortunately, the unconditional security of differential phase shift quantum key distribution has not been proved. Utilizing the sharp continuity of the von Neuman entropy and some basic inequalities, we estimate the upper bound for the eavesdropper Eve's information. We then prove the lower bound for the security of the differential phase shift quantum key distribution protocol against a one-pulse attack with Devatak-Winter's secret key rate formula.
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Received: 11 February 2011
Revised: 28 April 2011
Accepted manuscript online:
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PACS:
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03.67.Dd
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(Quantum cryptography and communication security)
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03.67.Hk
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(Quantum communication)
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03.67.-a
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(Quantum information)
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| Fund: Project supported by the National Fundamental Research Program of China (Grant No. 2006CB921900), National Natural Science Foundation of China (Grant Nos. 60537020 and 60621064), and the Innovation Funds of the Chinese Academy of Sciences. |
Cite this article:
Li Hong-Wei(李宏伟), Yin Zhen-Qiang(银振强), Wang Shuang(王双), Bao Wan-Su(鲍皖苏), Guo Guang-Can(郭光灿), and Han Zheng-Fu(韩正甫) Lower bound for the security of differential phase shift quantum key distribution against a one-pulse-attack 2011 Chin. Phys. B 20 100306
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