A 15-user quantum secure direct communication network

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

doi:10.1038/s41377-021-00634-2

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A 15-user quantum secure direct communication network

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- A 15-user quantum secure direct communication network
- A 15-user quantum secure direct communication network
- LSA 2021年10卷第12期页码：2322-2329
- Affiliations：
  
  1.State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Physics and Astronomy, Shanghai Jiao Tong University, 200240 Shanghai, China
  2.Department of Physics, Jiangxi Normal University, 330022 Nanchang, China
  3.Shanghai Research Center for Quantum Sciences, 201315 Shanghai, China
  4.Collaborative Innovation Center of Light Manipulation and Applications, Shandong Normal University, 250358 Jinan, China
- Author bio：
  
  Yuanhua Li (lyhua1984@jxnu.edu.cn)
  Xianfeng Chen (xfchen@sjtu.edu.cn)
- Funds：
- DOI：10.1038/s41377-021-00634-2
  中图分类号：
- 纸质出版日期：2021-12-31，
  
  网络出版日期：2021-09-14，
  
  收稿日期：2021-07-13，
  
  修回日期：2021-08-31，
  
  录用日期：2021-09-04
- Accepted：
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A 15-user quantum secure direct communication network[J]. LSA, 2021,10(12):2322-2329.

Qi, Z. T. et al. A 15-user quantum secure direct communication network. Light: Science & Applications, 10, 2322-2329 (2021).
A 15-user quantum secure direct communication network[J]. LSA, 2021,10(12):2322-2329. DOI： 10.1038/s41377-021-00634-2.

Qi, Z. T. et al. A 15-user quantum secure direct communication network. Light: Science & Applications, 10, 2322-2329 (2021). DOI： 10.1038/s41377-021-00634-2.

摘要

Abstract

Quantum secure direct communication (QSDC) based on entanglement can directly transmit confidential information. However

the inability to simultaneously distinguish the four sets of encoded entangled states limits its practical application. Here

we explore a QSDC network based on time–energy entanglement and sum-frequency generation. In total

15 users are in a fully connected QSDC network

and the fidelity of the entangled state shared by any two users is > 97%. 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 still > 95%

and the rate of information transmission can be maintained above 1 Kbp/s. Our 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.

关键词

Keywords

references

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