Practical issues of twin-field quantum key distribution

Feng-Yu Lu; Zhen-Qiang Yin; Rong Wang; Guan-Jie Fan-Yuan; Shuang Wang; De-Yong He; Wei Chen; Wei Huang; Bing-Jie Xu; Guang-Can Guo; Zheng-Fu Han

doi:10.1088/1367-2630/ab5a97

New Journal of Physics (Jan 2019)

Practical issues of twin-field quantum key distribution

Feng-Yu Lu,
Zhen-Qiang Yin,
Rong Wang,
Guan-Jie Fan-Yuan,
Shuang Wang,
De-Yong He,
Wei Chen,
Wei Huang,
Bing-Jie Xu,
Guang-Can Guo,
Zheng-Fu Han

Affiliations

Feng-Yu Lu: CAS Key Laboratory of Quantum Information, CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei 230026, People’s Republic of China; State Key Laboratory of Cryptology, PO Box 5159, Beijing 100878, People’s Republic of China
Zhen-Qiang Yin: ORCiD; CAS Key Laboratory of Quantum Information, CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei 230026, People’s Republic of China; State Key Laboratory of Cryptology, PO Box 5159, Beijing 100878, People’s Republic of China
Rong Wang: CAS Key Laboratory of Quantum Information, CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei 230026, People’s Republic of China; State Key Laboratory of Cryptology, PO Box 5159, Beijing 100878, People’s Republic of China
Guan-Jie Fan-Yuan: CAS Key Laboratory of Quantum Information, CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei 230026, People’s Republic of China; State Key Laboratory of Cryptology, PO Box 5159, Beijing 100878, People’s Republic of China
Shuang Wang: CAS Key Laboratory of Quantum Information, CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei 230026, People’s Republic of China; State Key Laboratory of Cryptology, PO Box 5159, Beijing 100878, People’s Republic of China
De-Yong He: CAS Key Laboratory of Quantum Information, CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei 230026, People’s Republic of China; State Key Laboratory of Cryptology, PO Box 5159, Beijing 100878, People’s Republic of China
Wei Chen: CAS Key Laboratory of Quantum Information, CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei 230026, People’s Republic of China; State Key Laboratory of Cryptology, PO Box 5159, Beijing 100878, People’s Republic of China
Wei Huang: Science and Technology on Communication Security Laboratory, Institute of Southwestern Communication, Chengdu, Sichuan 610041, People’s Republic of China
Bing-Jie Xu: Science and Technology on Communication Security Laboratory, Institute of Southwestern Communication, Chengdu, Sichuan 610041, People’s Republic of China
Guang-Can Guo: CAS Key Laboratory of Quantum Information, CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei 230026, People’s Republic of China; State Key Laboratory of Cryptology, PO Box 5159, Beijing 100878, People’s Republic of China
Zheng-Fu Han: CAS Key Laboratory of Quantum Information, CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei 230026, People’s Republic of China; State Key Laboratory of Cryptology, PO Box 5159, Beijing 100878, People’s Republic of China

DOI: https://doi.org/10.1088/1367-2630/ab5a97
Journal volume & issue: Vol. 21, no. 12
p. 123030

Abstract

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Twin-field quantum key distribution(TF-QKD) protocol and its variants, such as phase-matching QKD, sending-or-not-sending QKD and no phase post-selection TF-QKD(NPP-TFQKD), are very promising for long-distance applications. However, there are still some gaps between theory and practice in these protocols. Concretely, a finite-key size analysis is still missing, and the intensity fluctuations are not taken into account. To address the finite-key size effect, we first give the key rate of NPP-TFQKD against collective attack in finite-key size region and then prove it can be against coherent attack. To deal with the intensity fluctuations, we present an analytical formula of 4-intensity decoy state NPP-TFQKD and a practical intensity fluctuation model. Finally, through detailed simulations, we show NPP-TFQKD can still keep its superiority of high key rate and long achievable distance.

Published in New Journal of Physics

ISSN: 1367-2630 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Physics
Website: https://iopscience.iop.org/journal/1367-2630

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