发表机构
PhOSLab, Department of Electrical Engineering, Computer Engineering and Informatics, Cyprus University of Technology（塞浦路斯理工大学电气、计算机与信息工程系 PhOSLab）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
针对现有城域光纤上部署量子网络的挑战，本文提出并演示了一个七节点多层QKD网络，通过可重构光交换和频谱管理实现高可用性密钥分发，并揭示了跨层资源共享机制。
AI 中文摘要
扩展量子网络需要能够在光纤和设备受限的情况下延伸端到端服务可达性的架构。关键在于，在现有网络（棕地）部署中，量子网络必须围绕经典电信基础设施和量子密钥分发（QKD）技术的运行能力进行工程设计。为解决这一问题，我们展示了一个部署在现有城域光纤上的七节点多层QKD网络。该实现比较了频谱管理技术，以适应其各层所继承的约束。它将一个可信节点环与一个通过可重构光交换互连的三节点子网络相结合，在无需额外发射器的情况下扩展了物理连接性和服务可达性。一个网状密钥管理层将端点请求映射到可信中继路径，并为第1层、第3层和一次性密码本应用提供密钥。在73天内，八种链路配置生成了119.4 Gbit的密钥材料，链路可用性达到99.1%。随机化的端到端请求揭示了密钥消耗、存储密钥状态和量子层重构之间的间接跨层耦合，展示了通过可重构性、频谱复用和逻辑密钥管理抽象实现的资源共享。
英文摘要
Scaling quantum networks requires architectures extending end-to-end service reachability despite constrained fibre and equipment. Critically, in brownfield deployments, the quantum network must be engineered around classical telecommunications infrastructure and the operating capabilities of quantum key distribution (QKD) technology. To address this, we demonstrate a seven-node, multilayer QKD network deployed over existing metropolitan fibre. The implementation compares spectral management techniques to accommodate inherited constraints across its layers. It combines a trusted-node ring with a three-node subnetwork interconnected through reconfigurable optical switching, extending physical connectivity and service reachability without an additional transmitter. A meshed key management layer maps endpoint requests onto trusted-relay paths and supplies Layer 1, Layer 3, and one-time-pad applications. Over 73 days, eight link configurations generated 119.4 Gbit of secret key material with 99.1% link availability. Randomised end-to-end requests revealed indirect cross-layer coupling between key consumption, stored-key state and quantum-layer reconfiguration, demonstrating resource sharing through reconfigurability, spectral multiplexing and logical key-management abstraction.
Comments20 pages, 8 figures, includes supplementary
