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Chin. Phys. B, 2018, Vol. 27(8): 080305    DOI: 10.1088/1674-1056/27/8/080305
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Controlling a sine wave gating single-photon detector by exploiting its filtering loophole

Lin-Xi Feng(冯林溪)1,2, Mu-Sheng Jiang(江木生)1,2, Wan-Su Bao(鲍皖苏)1,2, Hong-Wei Li(李宏伟)1,2, Chun Zhou(周淳)1,2, Yang Wang(汪洋)1,2
1 Henan Key Laboratory of Quantum Information and Cryptography, Zhengzhou Information Science and Technology Institute, Zhengzhou 450001, China;
2 Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
Abstract  GHz single-photon detector (SPD) is a crucial part in the practical high speed quantum key distribution (QKD) system. However, any imperfections in a practical QKD system may be exploited by an eavesdropper (Eve) to collect information about the key without being discovered. The sine wave gating SPD (SG-SPD) based on InGaAs/InP avalanche photodiode, one kind of practical high speed SPD, may also contain loopholes. In this paper, we study the principle and characteristic of the SG-SPD and find out the filtering loophole of the SG-SPD for the first time. What is more, the proof-of-principle experiment shows that Eve could blind and control Bob's SG-SPD by exploiting this loophole. We believe that giving enough attention to this loophole can improve the practical security of the existing QKD system.
Keywords:  quantum key distribution      sine wave gating single-photon detector      quantum hacking      practical security  
Received:  24 February 2018      Revised:  10 May 2018      Accepted manuscript online: 
PACS:  03.67.Dd (Quantum cryptography and communication security)  
  03.67.Hk (Quantum communication)  
  42.50.Ex (Optical implementations of quantum information processing and transfer)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61605248 and 61505261).
Corresponding Authors:  Wan-Su Bao     E-mail:  2010thzz@sina.com

Cite this article: 

Lin-Xi Feng(冯林溪), Mu-Sheng Jiang(江木生), Wan-Su Bao(鲍皖苏), Hong-Wei Li(李宏伟), Chun Zhou(周淳), Yang Wang(汪洋) Controlling a sine wave gating single-photon detector by exploiting its filtering loophole 2018 Chin. Phys. B 27 080305

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