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
- Light: Science & Applications Vol. 10, Issue 12, Pages: 2322-2329(2021)
- 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
  CLC：
- Published：31 December 2021，
  
  Published Online：14 September 2021，
  
  Received：13 July 2021，
  
  Revised：31 August 2021，
  
  Accepted：04 September 2021
- Accepted：
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Qi, Z. T. et al. A 15-user quantum secure direct communication network. Light: Science & Applications, 10, 2322-2329 (2021).
DOI：

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.

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references

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