Scalable and Highly Fault-Tolerant Circular Quantum Byzantine Agreement
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Quantum Physics arXiv:2602.11592 (quant-ph) [Submitted on 12 Feb 2026] Title:Scalable and Highly Fault-Tolerant Circular Quantum Byzantine Agreement Authors:Chen-Xun Weng, Ming-Yang Li, Shi-Gen Li, Mengya Zhu, Xiao-Ran Sun, Hua-Lei Yin, Zeng-Bing Chen View a PDF of the paper titled Scalable and Highly Fault-Tolerant Circular Quantum Byzantine Agreement, by Chen-Xun Weng and 6 other authors View PDF HTML (experimental) Abstract:Quantum Byzantine Agreement (QBA), a cornerstone of quantum blockchain, offers inherent advantages in security and fault tolerance over classical protocols, guaranteed by the laws of quantum mechanics. However, existing multiparty QBA protocols face challenges for large-scale deployment due to exponential communication complexity or reliance on complex multi-particle entanglement. To address this, we propose a multiparty circular QBA protocol that adopts a semi-decentralized architecture, leveraging circular message gathering and quantum digital signatures to achieve quadratic communication complexity and enhanced fault tolerance. Our protocol is experimentally feasible, requiring only weak coherent states, and is compatible with existing star-shaped quantum networks. Simulations conducted on a global satellite-to-ground network demonstrate that the protocol sustains high consensus rates among multiple users, even when employing different key generation protocols under realistic conditions. This work presents a scalable framework for large-scale QBA networks, establishing the foundation for a practical quantum blockchain that enables secure and fault-tolerant decentralized services. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2602.11592 [quant-ph] (or arXiv:2602.11592v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2602.11592 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Hua-Lei Yin [view email] [v1] Thu, 12 Feb 2026 05:21:11 UTC (2,166 KB) Full-text links: Access Paper: View a PDF of the paper titled Scalable and Highly Fault-Tolerant Circular Quantum Byzantine Agreement, by Chen-Xun Weng and 6 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-02 References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv (What is alphaXiv?) Links to Code Toggle CatalyzeX Code Finder for Papers (What is CatalyzeX?) DagsHub Toggle DagsHub (What is DagsHub?) GotitPub Toggle Gotit.pub (What is GotitPub?) Huggingface Toggle Hugging Face (What is Huggingface?) Links to Code Toggle Papers with Code (What is Papers with Code?) ScienceCast Toggle ScienceCast (What is ScienceCast?) Demos Demos Replicate Toggle Replicate (What is Replicate?) Spaces Toggle Hugging Face Spaces (What is Spaces?) Spaces Toggle TXYZ.AI (What is TXYZ.AI?) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower (What are Influence Flowers?) Core recommender toggle CORE Recommender (What is CORE?) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs. Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)