Author:
Nian Hu,Nie Ya-Feng,Zhang Chun-Mei,Lu Liang-Liang
Abstract
Abstract
The SARG04 quantum key distribution protocol can offer greater robustness against photon number splitting attacks than the BB84 protocol that is implemented with weak pulses. In this paper, we propose a tight key analysis for the SARG04 protocol, by considering the one-decoy method and investigating its performance under the influence of a detector afterpulse. Our results demonstrate that an increase in block size leads to a slight increase in both the secure key rate and the maximum transmission distance. Importantly, the detector afterpulse plays a crucial role in practical applications and has a more pronounced effect on the SARG04 protocol compared to the BB84 protocol.
Funder
National Natural Science Foundation of China
Reference44 articles.
1. Quantum cryptography;Gisin;Rev. Mod. Phys.,2002
2. The security of practical quantum key distribution;Scarani;Rev. Mod. Phys.,2009
3. Secure quantum key distribution with realistic devices;Xu;Rev. Mod. Phys.,2020
4. Quantum Cryptography: Public Key Distribution and Coin Tossing.;Bennett,1984
5. Experimental quantum cryptography;Bennett;J. Cryptol.,1992