Dynamic Continuous Variable Quantum Key Distribution for Securing a Future Global Quantum Network

• URL: http://arxiv.org/abs/2502.11746v1
• Date: Mon, 17 Feb 2025 12:39:12 GMT
• Title: Dynamic Continuous Variable Quantum Key Distribution for Securing a Future Global Quantum Network
• Authors: Mikhael T. Sayat, Sebastian P. Kish, Ping Koy Lam, Nicholas J. Rattenbury, John E. Cater,
• Abstract summary: Continuous variable quantum key distribution (CVQKD) is a developing method to secure information exchange in future quantum networks. The structures of existing QKD networks are analysed, and how they can be fit into a general three-layer QKD network architecture.
• Score: 0.22369578015657954
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• Abstract: 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 could be within reach. In this work, the structures of existing QKD networks are analysed, and how they can be fit into a general overarching three-layer QKD network architecture for the endeavour of a global QKD network. Such a network could comprise of different links in fibre and free-space. The finite size limit secret key rates (SKRs) with multidimensional reconciliation were 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, fibre, and underwater links in descending order. The different links and nodes were classified and secret key distribution was 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.

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