Security of the Decoy State Two-Way Quantum Key Distribution with Finite Resources

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

Yong-Gang Tan, Q. Y. Cai

Yabin Gu, Wan‐Su Bao, Yang Wang +1 more

The quantum key distribution (QKD) allows two parties to share a secret key by typically making use of a one-way quantum channel. However, the two-way QKD has its own unique advantages, which means the two-way QKD has become a focus recently. To improve the practical performance of the two-way QKD, we present a security analysis of a two-way QKD protocol based on the decoy method with heralded single-photon sources (HSPSs). We make use of two approaches to calculate the yield and the quantum bit error rate of single-photon and two-photon pulses. Then we present the secret key generation rate based on the GLLP formula. The numerical simulation shows that the protocol with HSPSs has an advantage in the secure distance compared with weak coherent state sources. In addition, we present the final secret key generation rate of the LM05 protocol with finite resources by considering the statistical fluctuation of the yield and the error rate.

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

Mohd Fared Abdul Khir, Iskandar Bahari, M. N. Mohd Zain +1 more

Quantum Key Distribution (QKD) provides a mean for unconditionally secure secret key sharing for secure communication. For a practical QKD system, the recently proposed decoy state protocol has become an essential tool. In this work, we conduct numerical analysis against several bounds for one decoy state with two way QKD protocol and compare their performance in terms of key rate and maximum secure distance.