Chip-integrated quantum signature network over 200 km

Yongqiang Du; Bing-Hong Li; Xin Hua; Xiao-Yu Cao; Zhengeng Zhao; Feng Xie; Zhenrong Zhang; Hua-Lei Yin; Xi Xiao; Kejin Wei

doi:10.1038/s41377-025-01775-4

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Chip-integrated quantum signature network over 200 km

Original Articles

- Chip-integrated quantum signature network over 200 km
- Light: Science & Applications Vol. 14, Issue 4, Pages: 1061-1069(2025)
- Affiliations：
  
  1.Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University, Nanning 530004, China
  2.National Laboratory of Solid State Microstructures and School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  3.National Information Optoelectronics Innovation Center (NOEIC), Wuhan 430074, China
  4.Guangxi Key Laboratory of Multimedia Communications and Network Technology, School of Computer, Electronics, and Information, Guangxi University, Nanning 530004, China
  5.Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education), Renmin University of China, Beijing 100872, China
  6.Peng Cheng Laboratory, Shenzhen 518055, China
- Author bio：
  
  Hua-Lei Yin (hlyin@ruc.edu.cn)
  Xi Xiao (xxiao@wri.com.cn)
  Kejin Wei (kjwei@gxu.edu.cn)
- Funds：
- DOI：10.1038/s41377-025-01775-4
  CLC：
- Received：01 October 2024，
  
  Revised：24 January 2025，
  
  Accepted：2025-01-31，
  
  Published Online：04 March 2025，
  
  Published：30 April 2025
- Accepted：
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Du, Y. Q. et al. Chip-integrated quantum signature network over 200 km. Light: Science & Applications, 14, 1061-1069 (2025).
DOI：

Du, Y. Q. et al. Chip-integrated quantum signature network over 200 km. Light: Science & Applications, 14, 1061-1069 (2025). DOI： 10.1038/s41377-025-01775-4.

摘要

Abstract

The development of quantum networks is paramount towards practical and secure communications. Quantum digital signatures (QDS) offer an information-theoretically secure solution for ensuring data integrity

authenticity

and non-repudiation

rapidly growing from proof-of-concept to robust demonstrations. However

previous QDS systems relied on expensive and bulky optical equipment

limiting large-scale deployment and reconfigurable networking construction. Here

we introduce and verify a chip-based QDS network

placing the complicated and expensive measurement devices in the central relay while each user needs only a low-cost transmitter. We demonstrate the network with a three-node setup using an integrated encoder chip and decoder chip. By developing a 1-decoy-state one-time universal hashing-QDS protocol

we achieve a maximum signature rate of 0.0414 times per second for a 1 Mbit messages over fiber distances up to 200 km

surpassing all current state-of-the-art QDS experiments. This study validates the feasibility of chip-based QDS

paving the way for large-scale deployment and integration with existing fiber infrastructure.

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references

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