Long-Distance Continuous-Variable Quantum Key Distribution over 202.81 km of Fiber

被引：258

作者：

Zhang, Yichen ^{[1
]}

Chen, Ziyang ^{[2
,3
]}

Pirandola, Stefano ^{[4
]}

Wang, Xiangyu ^{[1
]}

Zhou, Chao ^{[1
]}

Chu, Binjie ^{[1
]}

Zhao, Yijia ^{[1
]}

Xu, Bingjie ^{[5
]}

Yu, Song ^{[1
]}

Guo, Hong ^{[2
,3
]}

机构：

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

[2] Peking Univ, Dept Elect, State Key Lab Adv Opt Commun Syst & Networks, Beijing 100871, Peoples R China

[3] Peking Univ, Ctr Quantum Informat Technol, Beijing 100871, Peoples R China

[4] Univ York, Dept Comp Sci, York YO10 5GH, N Yorkshire, England

[5] Inst Southwestern Commun, Sci & Technol Secur Commun Lab, Chengdu 610041, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 125卷 / 01期

基金：

中国国家自然科学基金; 英国工程与自然科学研究理事会;

关键词：

SECURE;

D O I：

10.1103/PhysRevLett.125.010502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Quantum key distribution provides secure keys resistant to code-breaking quantum computers. The continuous-variable version of quantum key distribution offers the advantages of higher secret key rates in metropolitan areas, as well as the use of standard telecom components that can operate at room temperature. However, the transmission distance of these systems (compared with discrete-variable systems) are currently limited and considered unsuitable for long-distance distribution. Herein, we report the experimental results of long distance continuous-variable quantum key distribution over 202.81 km of ultralow-loss optical fiber by suitably controlling the excess noise and employing highly efficient reconciliation procedures. This record-breaking implementation of the continuous-variable quantum key distribution doubles the previous distance record and shows the road for long-distance and large-scale secure quantum key distribution using room-temperature standard telecom components.

引用

页数：6

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