Dynamic Continuous Variable Quantum Key Distribution for Securing a Future Global Quantum Network
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866929718039674880 |
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| author | Sayat, Mikhael T. Kish, Sebastian P. Lam, Ping Koy Rattenbury, Nicholas J. Cater, John E. |
| author_facet | Sayat, Mikhael T. Kish, Sebastian P. Lam, Ping Koy Rattenbury, Nicholas J. Cater, John E. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_11746 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dynamic Continuous Variable Quantum Key Distribution for Securing a Future Global Quantum Network Sayat, Mikhael T. Kish, Sebastian P. Lam, Ping Koy Rattenbury, Nicholas J. Cater, John E. Quantum Physics 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. |
| title | Dynamic Continuous Variable Quantum Key Distribution for Securing a Future Global Quantum Network |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2502.11746 |