High-capacity device-independent quantum secure direct communication based on hyper-encoding  

作　　者：Hui Zeng Ming-Ming Du Wei Zhong Lan Zhou Yu-Bo Sheng 

机构地区：[1]College of Science,Nanjing University of Posts and Telecommunications,Nanjing 210023,China [2]College of Electronic and OpticalEngineering,&College ofFlexible Electronics(Future Technology),Nanjing University of Posts and Telecommunication,Nanjing 210023,China [3]Institute of Quantum Information and Technology,Nanjing University of Posts and Telecommunications,Nanjing 210003,China

出　　处：《Fundamental Research》2024年第4期851-857,共7页自然科学基础研究（英文版）

基　　金：the National Natural Science Foundation of China(11974189,12175106 and 92365110);the Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX22-0900).

摘　　要：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 thefurther development of DI-QSDC systems.

关 键 词：Quantum cryptography Device-independent Quantum secure direct communication Hyper-encoding Hyperentangled Bell state measurement Secret message capacity 

分 类 号：O41[理学—理论物理]