Scalable Fluxonium Quantum Processors via Tunable-Coupler Architecture
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Quantum Physics arXiv:2604.13363 (quant-ph) [Submitted on 15 Apr 2026] Title:Scalable Fluxonium Quantum Processors via Tunable-Coupler Architecture Authors:Ze Zhan, Zishuo Li, Fei Wang, Wangwei Lan, Xianchuang Pan, Liang Xiang, Xu Dou, Ran Gao, Guicheng Gong, Yanbo Guo, Quan Guan, Lijuan Hu, Ruizhi Hu, Honghong Ji, Lijing Jin, Yongyue Jin, Chengyao Li, Kannan Lu, Lu Ma, Xizheng Ma, Hongcheng Wang, Jiahui Wang, Huijuan Zhan, Tao Zhou, Xing Zhu, Chunqing Deng, Tenghui Wang View a PDF of the paper titled Scalable Fluxonium Quantum Processors via Tunable-Coupler Architecture, by Ze Zhan and 26 other authors View PDF HTML (experimental) Abstract:Superconducting quantum processors have largely converged on transmon-based architectures, while alternative qubit modalities with intrinsic error protection have lacked a demonstrated path to scalable system integration. In particular, although tunable-coupler-mediated interactions have been validated for small fluxonium systems, it remains unclear whether such designs can be scaled to a multi-qubit lattice. Here, we establish a scalable fluxonium processor architecture based on a modular qubit-coupler unit cell engineered to suppress residual interactions and spectator errors in a many-qubit lattice. The system enables parallel single-qubit gate fidelities approaching 99.99% and two-qubit CZ gate fidelities around 99%. With an optimized gate duration of 32 ns, the best CZ gate fidelity reaches 99.9%. We further validate this architecture in a 22-qubit processor based on the same configuration, where parallel operations enable the deterministic generation of Greenberger-Horne-Zeilinger states involving up to 10 qubits. Together, these results demonstrate that the fluxonium-tunable-coupler unit cell composes without emergent interaction pathologies and establish fluxonium as a scalable superconducting qubit platform. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.13363 [quant-ph] (or arXiv:2604.13363v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2604.13363 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Chunqing Deng [view email] [v1] Wed, 15 Apr 2026 00:10:00 UTC (8,975 KB) Full-text links: Access Paper: View a PDF of the paper titled Scalable Fluxonium Quantum Processors via Tunable-Coupler Architecture, by Ze Zhan and 26 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-04 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?) 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?)