Syndrome-Resolved Decoding of Qubit Readout Errors

Quantum Physics arXiv:2610.20810 (quant-ph) [Submitted on 14 Oct 2026] Title:Syndrome-Resolved Decoding of Qubit Readout Errors Authors:Han Zheng, Vladimir Pešić, Nikolay Gusarov, Andrea Lizzit, Taketo Imaizumi, Chulwoo Ahn, Marco Nicolas Mueller, Raymond Mencia, Edoardo Charbon, Vladimir E. Manucharyan View a PDF of the paper titled Syndrome-Resolved Decoding of Qubit Readout Errors, by Han Zheng and 9 other authors View PDF HTML (experimental) Abstract:Readout errors in superconducting qubits include incorrect state assignment, bit flips within the computational subspace, and leakage to non-computational states. These errors require different mitigation strategies, yet conventional measurement fidelity and repeatability metrics do not resolve their individual contributions. Previous repeated-readout studies have shown that temporal correlations reveal additional information about readout errors. Here we introduce the Readout Error Decoder (RED), which converts repeated thresholded binary records into a channel-resolved error budget. Controlled error injections validate the channel-specific response of the decoder. We demonstrate RED on both fluxonium and transmon qubits and across distinct leakage-lifetime regimes. RED identifies the error channels limiting readout performance without requiring dedicated discrimination of non-computational states, providing a basis for targeted readout optimization across different qubit modalities. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2610.20810 [quant-ph] (or arXiv:2610.20810v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2610.20810 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Han Zheng [view email] [v1] Wed, 14 Oct 2026 18:57:40 UTC (4,942 KB) Full-text links: Access Paper: View a PDF of the paper titled Syndrome-Resolved Decoding of Qubit Readout Errors, by Han Zheng and 9 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-10 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?)