Extracting Electromagnetic Bare Mode Couplings in Large Superconducting Quantum Processors

Quantum Physics arXiv:2609.22442 (quant-ph) [Submitted on 18 Sep 2026] Title:Extracting Electromagnetic Bare Mode Couplings in Large Superconducting Quantum Processors Authors:Reza Molavi, Ebrahim Forati, Yaxing Zhang, Andrey R. Klots, Juan Atalaya, Brandon W. Langley, Dogan A. Timucin, Moein Nazari, Ghazi Khan, Zlatko K. Minev, Alexander N. Korotkov, Michel H. Devoret View a PDF of the paper titled Extracting Electromagnetic Bare Mode Couplings in Large Superconducting Quantum Processors, by Reza Molavi and 11 other authors View PDF HTML (experimental) Abstract:High-fidelity control of superconducting quantum processors requires accurate characterization of electromagnetic coupling strengths among the device's constituent elements. Accurately extracting these couplings across large-scale architectures, presently featuring hundreds of qubits, poses a challenging multi-scale modeling problem. This requires resolving scales from the nanometer-scale geometry of Josephson junctions and their leads to the centimeter-scale size of the enclosing metallic packages. We present four numerical coupling extraction methods based on the avoided level crossing, the energy participation ratio, the induced electromotive force, and the impedance matrix. These methods are tailored to work with commercially available 3D electromagnetic solvers. We benchmark these techniques on a $10\times10$ array of transmon qubits, extracting their couplings to standing package modes. Our results show that these methods yield consistent coupling strengths with a maximum relative difference of less than 5%. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2609.22442 [quant-ph] (or arXiv:2609.22442v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2609.22442 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Reza Molavi [view email] [v1] Fri, 18 Sep 2026 18:01:41 UTC (3,203 KB) Full-text links: Access Paper: View a PDF of the paper titled Extracting Electromagnetic Bare Mode Couplings in Large Superconducting Quantum Processors, by Reza Molavi and 11 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-09 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?)