Scalable quantum error correction tailored for a heavy-hex qubit array
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Quantum Physics arXiv:2604.14296 (quant-ph) [Submitted on 15 Apr 2026] Title:Scalable quantum error correction tailored for a heavy-hex qubit array Authors:Seok-Hyung Lee, Xanda C. Kolesnikow, Jun Zen, Evan T. Hockings, Campbell K. McLauchlan, Georgia M. Nixon, Thomas R. Scruby, Stephen D. Bartlett, Robin Harper, Benjamin J. Brown View a PDF of the paper titled Scalable quantum error correction tailored for a heavy-hex qubit array, by Seok-Hyung Lee and 8 other authors View PDF HTML (experimental) Abstract:To produce an operable quantum computer that is made with imperfect hardware, we must design and test scalable quantum error correcting codes that are suited for the devices we can build and, in unison, develop decoding strategies that accommodate device-specific noise characteristics. Here, we introduce the \emph{dynamic compass code}, a subsystem code with a novel syndrome extraction cycle, that has a competitive threshold while making efficient use of qubits arranged on a heavy-hex lattice. We use a superconducting qubit array to implement a distance-5 instance of this code, and demonstrate how detailed noise characterisation can boost decoder performance to yield significant improvements in logical error rates. We perform averaged circuit eigenvalue sampling (ACES) to acquire detailed context-dependent error information on all elements of the syndrome extraction process. Furthermore, we leverage soft information produced from measurement devices to augment the decoder with measurement error information and detect leakage errors for exclusion through post-selection. Our noise-informed approach yields up to 38.3\% improvement in the logical error rate of a distance-5 implementation of the dynamic compass code in experiment. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.14296 [quant-ph] (or arXiv:2604.14296v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2604.14296 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Benjamin Brown [view email] [v1] Wed, 15 Apr 2026 18:00:21 UTC (7,805 KB) Full-text links: Access Paper: View a PDF of the paper titled Scalable quantum error correction tailored for a heavy-hex qubit array, by Seok-Hyung Lee and 8 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?)