近日，广西大学韦克金团队开发了超过200公里的芯片集成量子签名网络。2025年3月4日出版的《光：科学与应用》发表了这项成果。

量子网络的发展对实用和安全的通信至关重要。量子数字签名（QDS）提供了一种理论上安全的信息解决方案，用于确保数据的完整性、真实性和不可否认性，从概念验证迅速发展到强大的演示。然而，之前的量子点系统依赖于昂贵而笨重的光学设备，限制了大规模部署和可重构网络建设。

研究组介绍并验证了一种基于芯片的QDS网络，将复杂而昂贵的测量设备放置在中央继电器中，而每个用户只需要一个低成本的发射机。他们使用集成编码器芯片和解码器芯片的三节点设置演示了该网络。通过开发一种1态一次性通用散列QDS协议，在长达200公里的光纤距离上实现了1 Mbit消息每秒0.0414次的最大签名率，超过了目前所有最先进的QDS实验。该研究验证了基于芯片的QDS的可行性，为大规模部署和与现有光纤基础设施的集成铺平了道路。

附：英文原文

Title: Chip-integrated quantum signature network over 200 km

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

Issue&Volume: 2025-03-04

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 200km, 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.

DOI: 10.1038/s41377-025-01775-4

Source: https://www.nature.com/articles/s41377-025-01775-4