Practical decoy-state quantum secure direct communication

• DOI: 10.1007/s11433-021-1775-4
• Publication Date: 2021-10-30T18:03:09Z
• Authors: Xin Liu; Zijian Li; Di Luo; Chunfeng Huang; Di Ma; Minming Geng; Junwei Wang; Zhenrong Zhang; Kejin Wei
• Keywords: 0103 physical sciences; 01 natural sciences

Quantum secure direct communication (QSDC) has been demonstrated in both fiber-based and free-space channels using attenuated lasers. Decoy-state QSDC by exploiting four decoy states has been proposed to address the problem of photon-number-splitting attacks caused by the use of attenuated lasers. In this study, we present an analysis of the practical aspects of decoy-state QSDC. First, we design a two-decoy-state protocol that only requires two decoy states, thereby significantly reducing experimental complexity. Second, we successfully perform full parameter optimization for a real-life QSDC system by introducing a genetic algorithm. Our simulation results show that the two-decoy-state protocol could be the best choice for developing a practical QSDC system. Furthermore, full optimization is crucial for a high-performance QSDC system. Our work serves as a major step toward the further development of practical decoy-state QSDC systems.