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我国科学家在高安全量子密钥分发网络方面取得新进展
2022-07-24 02:21:00 【梁辰兴】
近日,中国科学技术大学郭光灿院士团队在量子密钥分发网络化研究方面取得重要进展。科研团队实现了抗环境干扰的非可信节点量子密钥分发网络,全面提高了量子密钥分发网络的安全性、可用性和可靠性,向实现下一代量子网络迈出了重要的一步。

网络安全是信息时代的重要主题,量子密钥分发网络以量子物理原理为基础,可为成千上万的用户提供信息论安全的保密通信服务,构建安全可控的网络环境。但网络中对于可信节点的需求提高了其实际部署的门槛,如何免除用户链路上必须可信的中间节点,降低对通信链路的安全性要求,从而构建下一代基于非可信节点的量子网络,是目前急需解决的问题。
测量设备无关量子密钥分发协议通过设置一个非可信节点对编码量子态进行联合测量,可在两个用户间构建安全的通信链路,是构建百公里级城域量子网络的重要角色。然而联合测量不仅限定了参与用户的数量,还对信道环境的稳定性提出了更高的要求,不利于在复杂网络环境下进行部署。科研团队多年来围绕这一问题展开深入研究。通过一系列技术攻关,科研团队完成了测量设备无关量子密钥分发网络的构建,使其同时具备抗环境干扰、无需可信节点、支持多用户灵活组网的特性。该成果推动了下一代量子保密通信网络的实用化,为未来量子互联网的具体形态做出了有益的探索。
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