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

Sayat, MT; Kish, SP; Lam, PK; Rattenbury, NJ; Cater, JE

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

Sayat, MT Kish, SP Lam, PK Rattenbury, NJ Cater, JE

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Publisher:: WILEY
Publication Type:: Journal Article
Citation:: ADVANCED QUANTUM TECHNOLOGIES, 2025, 8, (10)
Issue Date:: 2025-10

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Field	Value	Language
dc.contributor.author	Sayat, MT
dc.contributor.author	Kish, SP
dc.contributor.author	Lam, PK
dc.contributor.author	Rattenbury, NJ
dc.contributor.author	Cater, JE
dc.date.accessioned	2026-07-16T03:24:06Z
dc.date.available	2026-07-16T03:24:06Z
dc.date.issued	2025-10
dc.identifier.citation	ADVANCED QUANTUM TECHNOLOGIES, 2025, 8, (10)
dc.identifier.issn	2511-9044
dc.identifier.issn	2511-9044
dc.identifier.uri	http://hdl.handle.net/10453/195688
dc.description.abstract	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 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.
dc.language	English
dc.publisher	WILEY
dc.relation.ispartof	ADVANCED QUANTUM TECHNOLOGIES
dc.relation.isbasedon	10.1002/qute.202500135
dc.rights	info:eu-repo/semantics/openAccess
dc.subject.classification	4009 Electronics, sensors and digital hardware
dc.subject.classification	5108 Quantum physics
dc.title	Dynamic Continuous Variable Quantum Key Distribution for Securing a Future Global Quantum Network
dc.type	Journal Article
utslib.citation.volume	8
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology/School of Computer Science
utslib.copyright.status	open_access	*
dc.rights.license	This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0). To view a copy of this license, visit https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.date.updated	2026-07-16T03:24:05Z
pubs.issue	10
pubs.publication-status	Published
pubs.volume	8
utslib.citation.issue	10

Abstract:

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 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.

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http://hdl.handle.net/10453/195688