Implementation and security analysis of practical quantum secure direct communication

Ruoyang Qi; Zhen Sun; Zaisheng Lin; Penghao Niu; Wentao Hao; Liyuan Song; Qin Huang; Jiancun Gao; Liuguo Yin; Gui-Lu Long

doi:10.1038/s41377-019-0132-3

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Implementation and security analysis of practical quantum secure direct communication

Articles

- Implementation and security analysis of practical quantum secure direct communication
- Light: Science & Applications Vol. 8, Issue 1, Pages: 183-190(2019)
- Affiliations：
  
  1.State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, China
  2.School of Information and Technology, Tsinghua University, Beijing, 100084, China
  3.Beijing National Research Center for Information Science and Technology, Beijing, 100084, China
  4.School of Electronic and Information Engineering, Beihang University, Beijing, 100191, China
  5.Innovative Center of Quantum Matter, Beijing, 100084, China
  6.Beijing Academy of Quantum Information Science, Beijing, 100193, China
- Author bio：
  
  Liuguo Yin (yinlg@tsinghua.edu.cn)
  Gui-Lu Long(gllong@tsinghua.edu.cn)
- Funds：
- DOI：10.1038/s41377-019-0132-3
  CLC：
- Published：2019，
  
  Published Online：06 February 2019，
  
  Received：25 October 2018，
  
  Revised：13 January 2019，
  
  Accepted：17 January 2019
- Accepted：
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Qi, R. Y. et al. Implementation and security analysis of practical quantum secure direct communication. Light: Science & Applications, 8, 183-190 (2019).
DOI：

Qi, R. Y. et al. Implementation and security analysis of practical quantum secure direct communication. Light: Science & Applications, 8, 183-190 (2019). DOI： 10.1038/s41377-019-0132-3.

摘要

Abstract

Rapid development of supercomputers and the prospect of quantum computers are posing increasingly serious threats to the security of communication. Using the principles of quantum mechanics

quantum communication offers provable security of communication and is a promising solution to counter such threats. Quantum secure direct communication (QSDC) is one important branch of quantum communication. In contrast to other branches of quantum communication

it transmits secret information directly. Recently

remarkable progress has been made in proof-of-principle experimental demonstrations of QSDC. However

it remains a technical feat to bring QSDC into a practical application. Here

we report the implementation of a practical quantum secure communication system. The security is analyzed in the Wyner wiretap channel theory. The system uses a coding scheme of concatenation of low-density parity-check (LDPC) codes and works in a regime with a realistic environment of high noise and high loss. The present system operates with a repetition rate of 1 MHz at a distance of 1.5 kilometers. The secure communication rate is 50 bps

sufficient to effectively send text messages and reasonably sized files of images and sounds.

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