A 15-user quantum secure direct communication network

作     者：Zhantong Qi Yuanhua Li Yiwen Huang Juan Feng Yuanlin Zheng Xianfeng Chen Zhantong Qi;Yuanhua Li;Yiwen Huang;Juan Feng;Yuanlin Zheng;Xianfeng Chen

作者机构：State Key Laboratory of Advanced Optical Communication Systems and NetworksSchool of Physics and AstronomyShanghai Jiao Tong University200240 ShanghaiChina Department of PhysicsJiangxi Normal University330022 NanchangChina Shanghai Research Center for Quantum Sciences201315 ShanghaiChina Collaborative Innovation Center of Light Manipulation and ApplicationsShandong Normal University250358 JinanChina 

出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)

年 卷 期：2021年第10卷第12期

页      面：2322-2329页

核心收录：

学科分类：0810[工学-信息与通信工程] 08[工学] 081001[工学-通信与信息系统] 

基　　金：This work is supported in part by the National Key Research and Development Program of China(Grant No.2017YFA0303700) National Natural Science Foundation of China(Grant Nos.11734011,11804135,and 12074155) The Foundation for Shanghai Municipal Science and Technology Major Project(Grant No.2019SHZDZX01-ZX06) Project funded by China Postdoctoral Science Foundation(Grant No.2019M661476) 

主　　题：quantum hence realization 

摘      要：Quantum secure direct communication(QSDC)based on entanglement can directly transmit confidential ***,the inability to simultaneously distinguish the four sets of encoded entangled states limits its practical ***,we explore a QSDC network based on time–energy entanglement and sum-frequency *** total,15 users are in a fully connected QSDC network,and the fidelity of the entangled state shared by any two users is97%.The results show that when any two users are performing QSDC over 40 km of optical fiber,the fidelity of the entangled state shared by them is still95%,and the rate of information transmission can be maintained above 1 Kbp/*** result demonstrates the feasibility of a proposed QSDC network and hence lays the foundation for the realization of satellite-based long-distance and global QSDC in the future.