Practical decoy state quantum key distribution with finite resource

Shi‐Hai Sun, Lin-Mei Liang, Cheng-Zu Li

Gu Yabin, 鲍皖苏, Yang Wang +1 more

SongTing-Ting, ZHANG-Jie, QinSu-Juan +1 more

We analyze the security of finite-resource quantum key distribution with decoy states, and present the security bound for the practical implementations by introducing the deviations of the probabil...

Yi Zhao, Hoi‐Kwong Lo, Xiongfeng Ma +3 more

Chun Hua Zhou, Yu Zhi Zhou, Yang-Bin Xu +5 more

The decoy state quantum key distribution (QKD) protocol is proven to be an effective strategy against the photon number splitting attack. It was shown that the 1-decoy state protocol, easier to implement in the practical QKD system, outperforms the 2-decoy state protocol for block sizes of up to 108 bits. How intensity fluctuations influence the performance of the 1-decoy state protocol with finite resources remains a pending issue. In this paper, we present a finite-key analysis of the 1-decoy state protocol with intensity fluctuations and obtain the secret key rate formula about intensity fluctuations. Our numerical simulation results show that the stronger the intensity fluctuations, the lower the secret key rate for a small data block size of a few bits. Our research can provide theoretical implications for the selection of data size in the QKD system with intensity fluctuations.

Hongwei Li, Shuang Wang, Zhen−Qiang Yin +3 more

Security proof of practical quantum key distribution with finite resources has attracted a lot of attentions in recent years. We give a security analysis about finite resources QKD in this paper, our method is much simper comparing with previous security analysis in finite resources case,the simulation result shows that the security analysis is reasonable in practical QKD realizations with finite resources.