Mao Hao-Kun, Qiao Yu-Cheng, Li Qiong
Department of Computer Science and Technology, Harbin Institute of Technology, Harbin 150080, China.
Guangxi Key Lab Cryptography & Information Security, Guilin University of Electronic Technology, Guilin 541004, China.
Entropy (Basel). 2021 Oct 31;23(11):1440. doi: 10.3390/e23111440.
Quantum key distribution (QKD) is a promising technique to share unconditionally secure keys between remote parties. As an essential part of a practical QKD system, reconciliation is responsible for correcting the errors due to the quantum channel noise by exchanging information through a public classical channel. In the present work, we propose a novel syndrome-based low-density parity-check (LDPC) reconciliation protocol to reduce the information leakage of reconciliation by fully utilizing the syndrome information that was previously wasted. Both theoretical analysis and simulation results show that our protocol can evidently reduce the information leakage as well as the number of communication rounds.
量子密钥分发（QKD）是一种在远程通信方之间共享无条件安全密钥的很有前景的技术。作为实用QKD系统的一个重要组成部分，纠错通过公共经典信道交换信息来纠正由于量子信道噪声导致的错误。在本工作中，我们提出了一种基于校验子的新型低密度奇偶校验（LDPC）纠错协议，通过充分利用之前被浪费的校验子信息来减少纠错过程中的信息泄露。理论分析和仿真结果均表明，我们的协议能够显著减少信息泄露以及通信轮数。
