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Dynamic Continuous Variable Quantum Key Distribution for Securing a Future Global Quantum Network
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DOI：10.1002/qute.202500135.png)
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Abstract
En 中文
Continuous variable quantum key distribution (CVQKD) is a developing method to secure information exchange in future quantum networks. With the recent developments in quantum technology and greater access to space, a global quantum network secured by CVQKD can be within reach. In this work, the structures of existing QKD networks are analyzed, and how they can be fit into a general overarching three-layer QKD network architecture for the endeavor of a global QKD network. Such a network can comprise different links in fiber and free-space. The finite size limit secret key rates (SKRs) with multidimensional reconciliation are calculated for the different links for which CVQKD can be used in such a network. The results show that CVQKD generally achieves longer distances and larger SKRs in inter-satellite, satellite-to-ground, fiber, and underwater links in descending order. The different links and nodes are classified and secret key distribution is studied as a graph problem. The link capacity, a routing metric for secret key distribution, which considers a dynamic SKR based on dynamic links is presented. Its use in simulated CVQKD networks is presented for the aim of spatiotemporal secret key distribution through a dynamic CVQKD network.
Keywords:
network routing
quantum communications
quantum networks
quantum key distribution
Journal
A
IF:
4.3
Papers:
409
Citations:
3.2K
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