New passive decoy-state quantum key distribution with thermal distributed parametric down-conversion source

被引：1
|
作者：
Wei, Jie [1 ,2 ]
Zhang, Chun-Hui [1 ,2 ]
Wang, Qin [1 ,2 ,3 ]
机构：
[1] Nanjing Univ Posts & Telecommun, Inst Signal Proc Transmiss, Nanjing 210003, Jiangsu, Peoples R China
[2] Nanjing Univ Posts & Telecommun, Key Lab Broadband Wireless Commun & Sensor Networ, Minist Educ, Nanjing 210003, Jiangsu, Peoples R China
[3] Univ Sci & Technol China, Key Lab Quantum Informat, Hefei 230026, Peoples R China
来源：
QUANTUM INFORMATION PROCESSING | 2017年 / 16卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Quantum key distribution; Decoy state; Parametric down-conversion source; Weak coherent state;
D O I：
10.1007/s11128-016-1510-x
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We present a new scheme on implementing the passive quantum key distribution with thermal distributed parametric down-conversion source. In this scheme, only one-intensity decoy state is employed, but we can achieve very precise estimation on the single-photon-pulse contribution by utilizing those built-in decoy states. Moreover, we compare the new scheme with other practical methods, i.e., the standard three-intensity decoy-state BB84 protocol using either weak coherent states or parametric down-conversion source. Through numerical simulations, we demonstrate that our new scheme can drastically improve both the secure transmission distance and the key generation rate.
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收藏
页数：11
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