Passive decoy-state quantum key distribution for the weak coherent photon source with finite-length key

doi:10.1088/1674-1056/25/1/010305

中国物理B ›› 2016, Vol. 25 ›› Issue (1): 10305-010305.doi: 10.1088/1674-1056/25/1/010305

Passive decoy-state quantum key distribution for the weak coherent photon source with finite-length key

Yuan Li(李源), Wansu Bao(鲍皖苏), Hongwei Li(李宏伟), Chun Zhou(周淳), Yang Wang(汪洋)

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

收稿日期:2015-05-27 修回日期:2015-10-01 出版日期:2016-01-05 发布日期:2016-01-05
通讯作者: Wansu Bao E-mail:2010thzz@sina.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11304397).

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

Received:2015-05-27 Revised:2015-10-01 Online:2016-01-05 Published:2016-01-05
Contact: Wansu Bao E-mail:2010thzz@sina.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11304397).

摘要/Abstract

摘要： 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.

关键词: quantum key distribution, passive decoy-state, finite-length key, weak coherent pulses

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.

Key words: quantum key distribution, passive decoy-state, finite-length key, weak coherent pulses

中图分类号: (Quantum cryptography and communication security)

03.67.Dd

03.67.Hk (Quantum communication)

李源, 鲍皖苏, 李宏伟, 周淳, 汪洋. Passive decoy-state quantum key distribution for the weak coherent photon source with finite-length key[J]. 中国物理B, 2016, 25(1): 10305-010305.

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[J]. Chin. Phys. B, 2016, 25(1): 10305-010305.

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Passive decoy-state quantum key distribution for the weak coherent photon source with finite-length key

Passive decoy-state quantum key distribution for the weak coherent photon source with finite-length key

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