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Passive decoy-state quantum key distribution for the weak coherent photon source with finite-length key |
| Yuan Li(李源)1,2, Wansu Bao(鲍皖苏)1,2, Hongwei Li(李宏伟)1,2, Chun Zhou(周淳)1,2, Yang Wang(汪洋)1,2 |
1. Zhengzhou Information Science and Technology Institute, Zhengzhou 450004, China;
2. Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China |
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Abstract Passive decoy-state quantum key distribution systems, proven to be more desirable than active ones in some scenarios, also have the problem of device imperfections like finite-length keys. In this paper, based on the WCP source which can be used for the passive decoy-state method, we obtain the expressions of single-photon error rates, single-photon counts, and phase error rates. According to the information of smooth min-entropy, we calculate the key generation rate under the condition of finite-length key. Key generation rates with different numbers of pulses are compared by numerical simulations. From the results, it can be seen that the passive decoy-state method can have good results if the total number of pulses reaches 1010. We also simulate the passive decoy-state method with different probabilities of choosing a pulse for parameter estimation when the number of pulses is fixed.
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Received: 27 May 2015
Revised: 01 October 2015
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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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11304397). |
Corresponding Authors:
Wansu Bao
E-mail: 2010thzz@sina.com
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Cite this article:
Yuan Li(李源), Wansu Bao(鲍皖苏), Hongwei Li(李宏伟), Chun Zhou(周淳), Yang Wang(汪洋) Passive decoy-state quantum key distribution for the weak coherent photon source with finite-length key 2016 Chin. Phys. B 25 010305
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