Side-Channel-Secure Quantum Key Distribution with Imperfect Vacuum Sources

Jiang, Cong1,2; Yu, Zong-Wen3; Hu, Xiao-Long4; Wang, Xiang-Bin1,2,5,6,7,8

2023-06-01

10.1103/PhysRevApplied.19.064003

PHYSICAL REVIEW APPLIED   影响因子和分区

2331-7019

The side-channel-secure (SCS) quantum key distribution (QKD), SCS QKD has attracted much atten-tion due to its higher security compared to the measurement-device-independent protocols. It is not only measurement-device-independent secure, but also secure against source-state side channels provided that Eve has no access to Alice's or Bob's setups inside their labs. In the original protocol for SCS QKD, the side channels and the intensities of the coherent sources are allowed to be different in different time windows, but the vacuum sources of Alice and Bob have to be perfect, which is impossible in practice due to the finite extinction ratio of the intensity modulators. In this paper, we present a method that does not need the perfect vacuum source requested by the original protocol and assures the result as secure as the original protocol. With the upper bounds of the amplitudes of the nonvacuum part of the sources, the secure key rate of our SCS QKD protocol here with imperfect vacuum and unstable sources can be calculated. The numerical results show that, the secure distance of the SCS QKD protocol exceeds 150 km, provided that the intensity of the imperfect vacuum source is less than 10-8, which can be achieved in the experiment by a two-stage intensity modulator, where we also show that the active odd-parity pairing method and standard pairing method using two-way classical communication can be applied to the SCS QKD protocol to improve the key rate. Given the side-channel security based on the existing technological level, this work makes it possible to realize side-channel-secure QKD with real devices.

SCI

英语

通讯

Ministration of Science and Technology of China through The National Key Research and Development Program of China[2020YFA0309701] ; National Natural Science Foundation of China["12174215","12104184","11974204","12147107"] ; Shandong Provincial Natural Science Foundation[ZR2021LLZ007] ; Key Ramp;D Plan of Shandong Province[2021ZDPT01] ; Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics[KF202110]

Physics

Physics, Applied

WOS:001025823600001

AMER PHYSICAL SOC

Web of Science

1.Jinan Inst Quantum Technol, Jinan 250101, Shandong, Peoples R China
2.Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China
3.Data Commun Sci & Technol Res Inst, Beijing 100191, Peoples R China
4.Sun Yat sen Univ, Sch Phys, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Peoples R China
5.Frontier Sci Ctr Quantum Informat, Beijing, Peoples R China
6.Univ Sci & Technol China, CAS Ctr Excellence & Synerget Innovat, Ctr Quantum Informat & Quantum Phys, Shanghai Branch, Shanghai 201315, Peoples R China
7.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
8.Southern Univ Sci & Technol, Phys Dept, Shenzhen 518055, Peoples R China

Jiang, Cong,Yu, Zong-Wen,Hu, Xiao-Long,et al. Side-Channel-Secure Quantum Key Distribution with Imperfect Vacuum Sources[J]. PHYSICAL REVIEW APPLIED,2023,19(6).

Jiang, Cong,Yu, Zong-Wen,Hu, Xiao-Long,&Wang, Xiang-Bin.(2023).Side-Channel-Secure Quantum Key Distribution with Imperfect Vacuum Sources.PHYSICAL REVIEW APPLIED,19(6).

Jiang, Cong,et al."Side-Channel-Secure Quantum Key Distribution with Imperfect Vacuum Sources".PHYSICAL REVIEW APPLIED 19.6(2023).