Zeng Hui, Du Ming-Ming, Zhong Wei, Zhou Lan, Sheng Yu-Bo
College of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China.
College of Electronic and Optical Engineering, & College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing 210023, China.
Fundam Res. 2023 Nov 30;4(4):851-857. doi: 10.1016/j.fmre.2023.11.006. eCollection 2024 Jul.
Quantum secure direct communication (QSDC) can directly transmit secret messages through quantum channel without keys. Device-independent (DI) QSDC guarantees the message security relying only on the observation of the Bell-inequality violation, but not on any detailed description or trust of the devices' inner workings. Compared with conventional QSDC, DI-QSDC has relatively low secret message capacity. To increase DI-QSDC's secret messages capacity, we propose a high-capacity DI-QSDC protocol based on the hyper-encoding technique. The total message leakage rate of our DI-QSDC protocol only relies on the most robust degree of freedom. We provide the numerical simulation of its secret message capacity altered with the communication distance. Our work serves as an important step toward the further development of DI-QSDC systems.
量子安全直接通信（QSDC）可以通过量子信道直接传输秘密消息而无需密钥。与设备无关（DI）的QSDC仅依靠对贝尔不等式违背的观测来保证消息安全，而不依赖于对设备内部工作原理的任何详细描述或信任。与传统的QSDC相比，DI-QSDC的秘密消息容量相对较低。为了提高DI-QSDC的秘密消息容量，我们提出了一种基于超编码技术的高容量DI-QSDC协议。我们的DI-QSDC协议的总消息泄漏率仅依赖于最稳健的自由度。我们给出了其秘密消息容量随通信距离变化的数值模拟。我们的工作是朝着DI-QSDC系统的进一步发展迈出的重要一步。
