减轻光源抖动对量子密钥分发性能影响的方法

量子电子学报 ›› 2020, Vol. 37 ›› Issue (1): 57-62.

减轻光源抖动对量子密钥分发性能影响的方法

沙倚天1，冯宝2,3*，贾玮2,3，李维1

1国网江苏省电力有限公司南京供电分公司，江苏南京 210024； 2南瑞集团有限公司(国网电力科学研究院有限公司)，江苏南京 211106； 3南京南瑞国盾量子技术有限公司，江苏南京 211106

收稿日期:2019-07-16 修回日期:2019-11-11 出版日期:2020-01-28 发布日期:2020-01-28
通讯作者: 冯宝 E-mail:nanrui@protonmail.com
作者简介:沙倚天（1985-），女，江苏南京人，硕士，工程师，主要从事网络和信息安全方面的研究；E-mail:nrgd_lw@163.com。
基金资助:
Supported by Program of Science and Technology Project of State Grid Jiangsu Electric Power Co., Ltd., Application of Quantum Secret Communication Technology in Power System Business (国网江苏省电力有限公司科技项目，量子保密通信技术在电力系统业务中的应用研究，J2018061)

A method to eliminate the influence of statistical fluctuation on the source parameters for quantum key distribution

SHA Yitian1, FENG Bao2,3*, JIA Wei2,3,LI Wei1

1 State Grid Nanjing Power Supply Company, Nanjing 210024, China; 2 NARI Group Corporation/State Grid Electric Power Research Institute, Nanjing 211106, China; 3 NRGD Quantum Technology Co., Ltd., Nanjing 211106, China

Received:2019-07-16 Revised:2019-11-11 Published:2020-01-28 Online:2020-01-28
Contact: Bao Feng E-mail:nanrui@protonmail.com

摘要/Abstract

摘要： 在实际的量子密钥分发系统中，光源参数会随着时间、环境的变化而抖动，导致量子密钥分发的成码率等性能下降。提出一种减轻光源抖动对量子密钥分发性能影响的方法。该方法使用标记相干态光源代替广泛使用的弱相干态光源，可以有效地提高量子密钥分发在光源抖动下的安全密钥生成率，克服光源抖动对量子密钥分发性能的影响，并增大传输距离。通过理论分析和数值仿真验证了本方法的可行性，本方法对量子密钥分发的实际应用提供了一种思路。

关键词: 量子光学, 量子密钥分发, 标记相干态, 光源抖动, 安全密钥

Abstract: In the real quantum key distribution (QKD) system, statistical fluctuation on the source parameters will happen with the changes of time and environment, which causes a serve decrease of the key rate. In this paper, we propose a method to eliminate the influence of statistical fluctuation on the source parameters for QKD. The method can use heralded coherent sources to replace the widely used weak coherent sources, which can significantly improve key rate of QKD with statistical fluctuation on the source parameters and thus eliminate the influence of statistical fluctuation on the source parameters. In addition, the maximum transmission distance is also significantly improved. Both the theoretical analysis and numerical simulation verify the feasibility of the method. The method can provide a way to the practical application of QKD.

Key words: quantum optics, quantum key distribution, heralded coherent source, source fluctuation, secure key

中图分类号:

O431.2

沙倚天冯宝贾玮李维. 减轻光源抖动对量子密钥分发性能影响的方法[J]. 量子电子学报, 2020, 37(1): 57-62.

SHA Yitian, FENG Bao, JIA Wei, LI Wei. A method to eliminate the influence of statistical fluctuation on the source parameters for quantum key distribution[J]. Chinese Journal of Quantum Electronics, 2020, 37(1): 57-62.

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