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A long-distance quantum key distribution scheme based on pre-detection of optical pulse with auxiliary state |
Quan Dong-Xiao (权东晓), Zhu Chang-Hua (朱畅华), Liu Shi-Quan (刘世全), Pei Chang-Xing (裴昌幸) |
State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071, China |
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Abstract We construct a circuit based on PBS and CNOT gates, which can be used to determine whether the input pulse is empty or not according to the detection result of the auxiliary state, while the input state will not be changed. The circuit can be treated as a pre-detection device. Equipping the pre-detection device in the front of the receiver of the quantum key distribution (QKD) can reduce the influence of the dark count of the detector, hence increasing the secure communication distance significantly. Simulation results show that the secure communication distance can reach 516 km and 479 km for QKD with perfect single photon source and decoy-state QKD with weak coherent photon source, respectively.
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Received: 02 September 2014
Revised: 20 November 2014
Accepted manuscript online:
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PACS:
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03.67.Hk
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(Quantum communication)
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03.67.Dd
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(Quantum cryptography and communication security)
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03.67.Ac
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(Quantum algorithms, protocols, and simulations)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61372076), the Programme of Introducing Talents of Discipline to Universities, China (Grant No. B08038), and the Fundamental Research Funds for the Central Universities, China (Grant No. K5051201021). |
Corresponding Authors:
Quan Dong-Xiao
E-mail: dxquan@xidian.edu.cn
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About author: 03.67.Hk; 03.67.Dd; 03.67.Ac |
Cite this article:
Quan Dong-Xiao (权东晓), Zhu Chang-Hua (朱畅华), Liu Shi-Quan (刘世全), Pei Chang-Xing (裴昌幸) A long-distance quantum key distribution scheme based on pre-detection of optical pulse with auxiliary state 2015 Chin. Phys. B 24 050309
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