Realization of quantum secure direct communication over 100 km fiber with time-bin and phase quantum states

Haoran Zhang; Zhen Sun; Ruoyang Qi; Liuguo Yin; Gui-Lu Long; Jianhua Lu

doi:10.1038/s41377-022-00769-w

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Realization of quantum secure direct communication over 100 km fiber with time-bin and phase quantum states

Articles

- Realization of quantum secure direct communication over 100 km fiber with time-bin and phase quantum states
- Light: Science & Applications Vol. 11, Issue 5, Pages: 787-795(2022)
- Affiliations：
  
  1.State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, China
  2.Beijing Academy of Quantum Information Science, Beijing, China
  3.School of Information and Technology, Tsinghua University, Beijing, China
  4.Beijing Institute of Spacecraft System Engineering, Beijing, China
  5.Frontier Science Center for Quantum Information, Beijing, China
  6.Beijing National Research Center for Information Science and Technology, Beijing, China
- Author bio：
  
  Liuguo Yin (yinlg@tsinghua.edu.cn)
  Gui-Lu Long (gllong@tsinghua.edu.cn)
- Funds：
- DOI：10.1038/s41377-022-00769-w
  CLC：
- Published：31 May 2022，
  
  Published Online：06 April 2022，
  
  Received：21 October 2021，
  
  Revised：01 March 2022，
  
  Accepted：12 March 2022
- Accepted：
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Zhang, H. R. et al. Realization of quantum secure direct communication over 100 km fiber with time-bin and phase quantum states. Light: Science & Applications, 11, 787-795 (2022).
DOI：

Zhang, H. R. et al. Realization of quantum secure direct communication over 100 km fiber with time-bin and phase quantum states. Light: Science & Applications, 11, 787-795 (2022). DOI： 10.1038/s41377-022-00769-w.

摘要

Abstract

Rapid progress has been made in quantum secure direct communication in recent years. For practical application

it is important to improve the performances

such as the secure information rate and the communication distance. In this paper

we report an elaborate physical system design and protocol with much enhanced performance. This design increased the secrecy capacity greatly by achieving an ultra-low quantum bit error rate of < 0.1%

one order of magnitude smaller than that of existing systems. Compared to previous systems

the proposed scheme uses photonic time-bin and phase states

operating at 50 MHz of repetition rate

which can be easily upgraded to over 1 GHz using current on-the-shelf technology. The results of our experimentation demonstrate that the proposed system can tolerate more channel loss

from 5.1 dB

which is about 28.3 km in fiber in the previous scheme

to 18.4 dB

which corresponds to fiber length of 102.2 km. Thus

the experiment shows that intercity quantum secure direct communication through fiber is feasible with present-day technology.

关键词

Keywords

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