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Improved statistical fluctuation analysis for twin-field quantum key distribution

Authors
Park, JooyounLee, JonghyunHeo, Jun
Issue Date
4월-2021
Publisher
SPRINGER
Keywords
Quantum key distribution; Twin-field QKD; Finite-size effect; Decoy state
Citation
QUANTUM INFORMATION PROCESSING, v.20, no.4
Indexed
SCIE
SCOPUS
Journal Title
QUANTUM INFORMATION PROCESSING
Volume
20
Number
4
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/128345
DOI
10.1007/s11128-021-03035-x
ISSN
1570-0755
Abstract
The decoy state scheme is the most widely studied quantum key distribution protocol to detect existence of eavesdropping. Twin-field quantum key distribution (TF-QKD) is a promising protocol for realizing secret key sharing over long distances. However, the secret key rate becomes relatively low considering the finite-size effect. In this study, the statistical fluctuation analysis of the four-intensity decoy-state TF-QKD system proposed in a recent study (Zhang et al. in Phys Rev A 95:012333, 2017) is considered, and its performance is compared with the results of the Gaussian approximation and Chernoff bound methods. Numerical simulations show that the suggested method shows a considerable improvement in both the key generation rate and transmission distance over the Chernoff bound method under actual experimental environment. We find that the scheme increases secret key rate 1.04-4.06 times and transmission distances 10-18 km farther. We also present optimized parameters for Gaussian, Chernoff, and our scheme.
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