Continuous-variable QKD over 50 km commercial fiber

被引：169

作者：

Zhang, Yichen ^{[1
,2
]}

Li, Zhengyu ^{[1
]}

Chen, Ziyang ^{[1
]}

Weedbrook, Christian ^{[3
]}

Zhao, Yijia ^{[2
]}

Wang, Xiangyu ^{[2
]}

Huang, Yundi ^{[2
]}

Xu, Chunchao ^{[2
]}

Zhang, Xiaoxiong ^{[2
]}

Wang, Zhenya ^{[2
]}

Li, Mei ^{[2
]}

Zhang, Xueying ^{[2
]}

Zheng, Ziyong ^{[2
]}

Chu, Binjie ^{[2
]}

Gao, Xinyu ^{[2
]}

Meng, Nan ^{[2
]}

Cai, Weiwen ^{[4
]}

Wang, Zheng ^{[5
]}

Wang, Gan ^{[1
]}

Yu, Song ^{[2
]}

Guo, Hong ^{[1
,2
]}

机构：

[1] Peking Univ, State Key Lab Adv Opt Commun Syst & Networks, Sch Elect Engn & Comp Sci, Ctr Quantum Informat Technol,Ctr Computat Sci & E, Beijing 100871, Peoples R China

[2] Beijing Univ Posts & Telecommun, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China

[3] Xanadu, 372 Richmond St W, Toronto, ON M5V 2L7, Canada

[4] China Mobile Grp Guangdong Co Ltd, Guangzhou 510623, Guangdong, Peoples R China

[5] Xian Uotocom Network Technol Co Ltd, Xian 710075, Shaanxi, Peoples R China

来源：

QUANTUM SCIENCE AND TECHNOLOGY | 2019年 / 4卷 / 03期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

quantum cryptography; continuous variable; field test; QUANTUM KEY DISTRIBUTION; FIELD-TEST; SECURITY;

D O I：

10.1088/2058-9565/ab19d1

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The continuous-variable version of quantum key distribution (QKD) offers the advantages (over discrete-variable systems) of higher secret key rates in metropolitan areas, as well as the use of standard telecom components that can operate at room temperature. An important step in the real-world adoption of continuous-variable QKD is the deployment of field tests over commercial fibers. Here we report two different field tests of a continuous-variable QKD system through commercial fiber networks in Xi'an and Guangzhou over distances of 30.02 km (12.48 dB) and 49.85 km (11.62 dB), respectively. We achieve secure key rates two orders-of-magnitude higher than previous field test demonstrations by employing an efficient calibration model with one-time evaluation. This accomplishment is also realized by developing a fully automatic control system which stabilizes system noise, and by applying a rate-adaptive reconciliation method which maintains high reconciliation efficiency with high success probability in fluctuated environments. Our results pave the way for the deployment of continuous-variable QKD in metropolitan settings.

引用

页数：12

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