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Security of quantum key distribution with virtual mutually unbiased bases

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In a perfect quantum key distribution(QKD)protocol,quantum states should be prepared and measured with mutually unbiased bases(MUBs).However,in a practical QKD system,quantum states are generally prepared and measured with imperfect MUBs using imperfect devices,possibly reducing the secret key rate and transmission distance.To analyze the security of a QKD system with imperfect MUBs,we propose virtual MUBs to characterize the quantum channel against collective attack,and analyze the corresponding secret key rate under imperfect state preparation and measurement conditions.More generally,we apply the ad-vantage distillation method for analyzing the security of QKD with imperfect MUBs,where the error tolerance and transmission distance can be sharply improved.Our analysis method can be applied to benchmark and standardize a practical QKD system,elucidating the security analysis of different QKD protocols with imperfect devices.

quantum key distributionmutually unbiased basesadvantage distillation

Hong-Wei Li、Chen-Peng Hao、Zhi-Jiang Chen、Li Gong、Yi-Fei Lu、Yang Wang、Jia-Ji Li、Chun-Mei Zhang、Rong Wang、Zhen-Qiang Yin、Qing-Yu Cai

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Henan Key Laboratory of Quantum Information and Cryptography,SSFIEU,Zhengzhou 450000,China

Institute of Quantum Information and Technology,Nanjing University of Posts and Telecommunications,Nanjing 210003,China

Department of Physics,University of Hong Kong,Hong Kong 999077,China

Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China

School of Information and Communication Engineering,Hainan University,Haikou 570228,China

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National Safety Academic FundNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Henan

U21302056237124462171424242300421219

2024

10.1007/s11433-024-2378-1

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(7)