基于交换的量子密钥分发网络的优化部署
Optimizing the deployment of quantum key distribution switch-based networks
摘要：
量子密钥分发（QKD）网络提供了一种通过量子和可信经典信道在合法方之间建立信息论安全密钥的基础设施。在现实世界条件下部署QKD网络面临着几个挑战，这些挑战特别与QKD设备的高成本以及提供合理的密钥速率的条件有关。在这项工作中，我们提出了一种QKD网络架构，通过使用光开关和减少使用单光子探测器的QKD接收器设备的数量，大大降低了部署QKD网络的成本。我们描述了QKD网络协议的相应修改。我们还提供了一个网络链路的总长度为670公里的8个节点组成的估计，并证明了基于交换机的架构可以实现高达28%的显着的资源节约，而吞吐量仅减少了8%。
英文摘要：
Quantum key distribution (QKD) networks provide an infrastructure for establishing information-theoretic secure keys between legitimate parties via quantum and authentic classical channels. The deployment of QKD networks in real-world conditions faces several challenges, which are related in particular to the high costs of QKD devices and the condition to provide reasonable secret key rates. In this work, we present a QKD network architecture that provides a significant reduction in the cost of deploying QKD networks by using optical switches and reducing the number of QKD receiver devices, which use single-photon detectors. We describe the corresponding modification of the QKD network protocol. We also provide estimations for a network link of a total of 670 km length consisting of 8 nodes, and demonstrate that the switch-based architecture allows achieving significant resource savings of up to 28%, while the throughput is reduced by 8% only.
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