预报单光子源诱骗态量子密钥产生率及数值计算

计算物理 ›› 2009, Vol. 26 ›› Issue (1): 141-146.

预报单光子源诱骗态量子密钥产生率及数值计算

权东晓¹, 裴昌幸¹, 马怀新², 刘丹¹, 阎毅¹

1. 西安电子科技大学综合业务网国家重点实验室, 陕西西安 710071;
2. 清华大学物理系北京 100084

收稿日期:2007-09-30 修回日期:2008-02-20 出版日期:2009-01-25 发布日期:2009-01-25
作者简介:权东晓(1980-),女,河南洛阳．助教,博士生,从事量子通信研究,西安电子科技大学105信箱710071.
基金资助:
国家自然科学基金(60572147,60672119);陕西省科技攻关(2006k04-G33)资助项目

Quantum Key Generation Rate of Decoy State Quantum Key Distribution with Heralded Single-photon Source

QUAN Dongxiao¹, PEI Changxing¹, MA Huaixin², LIU Dan¹, YAN Yi¹

1. State Key Lab of Integrated Services Networks, Xidian University, Xi'an 710071, China;
2. Department of Physics, Tsinghua University, Beijing 100084, China

Received:2007-09-30 Revised:2008-02-20 Online:2009-01-25 Published:2009-01-25

摘要/Abstract

摘要： 独立推导预报单光子源诱骗态量子密钥分发的密钥产生率计算公式,讨论密钥产生率和发送端探测效率的关系;进行弱相干光和预报单光子源诱骗态量子密钥分发的最优强度估计和密钥产生率数值计算.结果表明,预报单光子源诱骗态量子密钥分发的密钥产生率随着发送端探测效率的增加而增加,其安全通信距离与完美单光子源的通信距离一致;诱骗态量子密钥分发可提高安全通信距离和密钥产生率;预报单光子源由于减少了暗计数的影响,进一步提高了安全通信距离.

关键词: 量子密钥分发, 诱骗态, 预报单光子源, 密钥产生率

Abstract: Quantum key generation rate of decoy state quantum key distribution(QKD) with a heralded single-photon source(HSPS) is deduced.Relationship between quantum key generation rate and detection efficiency of sender is discussed.Optimal intensities and key generation rate of decoy state QKD with a weak coherent pulse(WCP) and an HSPS are analyzed.It shows that key generation rate increases with increase of detection efficiency of sender and its security distance is the same as with a perfect single photon source.Decoy state QKD increases security distance and key rate of QKD.Due to less dark counts QKD with HSPS works longer distance than WCP.

Key words: quantum key distribution, decoy state, heralded single-photon source, key generation rate

中图分类号:

O431.2
TN918

权东晓, 裴昌幸, 马怀新, 刘丹, 阎毅. 预报单光子源诱骗态量子密钥产生率及数值计算[J]. 计算物理, 2009, 26(1): 141-146.

QUAN Dongxiao, PEI Changxing, MA Huaixin, LIU Dan, YAN Yi. Quantum Key Generation Rate of Decoy State Quantum Key Distribution with Heralded Single-photon Source[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2009, 26(1): 141-146.

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