High-fidelity iSWAP gate with Double Transmon Coupler
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Quantum Physics arXiv:2604.27080 (quant-ph) [Submitted on 29 Apr 2026] Title:High-fidelity iSWAP gate with Double Transmon Coupler Authors:Tarush Tiwari, Sudhir K. Sahu, Guilhem Ribeill, Michael Senatore, Matthew D. LaHaye, Raymond W. Simmonds, Daniel L. Campbell, Archana Kamal, Leonardo Ranzani View a PDF of the paper titled High-fidelity iSWAP gate with Double Transmon Coupler, by Tarush Tiwari and 7 other authors View PDF HTML (experimental) Abstract:Entangling operations are at the heart of all approaches to quantum information processing. Parametric gates, in particular, offer a versatile solution to strongly couple off-resonant superconducting qubits with suppressed parasitic crosstalk to spectator qubits due to frequency-selective activation. In this work, we demonstrate a parametric iSWAP gate between two transmon qubits using the recently developed double transmon coupler (DTC). The DTC supports robust internally-defined cancellation point (``off'' state) for static interactions, while simultaneously mediating a fast parametric coupling between data qubits that can be deployed for high-fidelity two-qubit operations. We use robust phase estimation to calibrate non-commuting error terms in the parametric iSWAP gate, and achieve a 99.827% gate fidelity in 40ns without any numerical optimization. The circuit architecture and calibration techniques developed here are extensible to other gate implementations and qubit modalities, paving the way towards resource-efficient quantum information processing. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.27080 [quant-ph] (or arXiv:2604.27080v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2604.27080 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Tarush Tiwari [view email] [v1] Wed, 29 Apr 2026 18:19:05 UTC (32,928 KB) Full-text links: Access Paper: View a PDF of the paper titled High-fidelity iSWAP gate with Double Transmon Coupler, by Tarush Tiwari and 7 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?)