Multimode Strong-Coupling Processes in Circuit QED Lattices
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Quantum Physics arXiv:2605.00983 (quant-ph) [Submitted on 1 May 2026] Title:Multimode Strong-Coupling Processes in Circuit QED Lattices Authors:Won Chan Lee, Ali Fahimniya, Kellen O'Brien, Yu-Xin Wang, Alexandra Behne, Maya Amouzegar, Alexey V. Gorshkov, Alicia J. Kollár View a PDF of the paper titled Multimode Strong-Coupling Processes in Circuit QED Lattices, by Won Chan Lee and 7 other authors View PDF Abstract:Circuit QED systems provide an ideal platform for exploring the strong-coupling regime of multimode cavity QED. Here we present two new phenomena from multimode strong coupling: a circuit Lagrangian analysis which captures beyond tight-binding effects of strong photon-photon coupling and experimental observation of strong wave-mixing resonances in the qubit response. Our circuit analysis reveals qualitatively new features such as emergent band gaps, lifted degeneracies, broadened flat bands, and frequency-dependent hopping. Within the multimode photon environment, strong qubit-photon coupling in turn gives rise to multiphoton processes involving multiple normal modes. We demonstrate a strong four-wave-mixing process involving excitation of a qubit and simultaneous frequency conversion between modes. Notably, this wave-mixing process is dominated by localized flat-band modes of the photonic lattice, which exhibit the strongest coupling to the transmon qubit. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2605.00983 [quant-ph] (or arXiv:2605.00983v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2605.00983 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Won Chan Lee [view email] [v1] Fri, 1 May 2026 18:00:01 UTC (4,293 KB) Full-text links: Access Paper: View a PDF of the paper titled Multimode Strong-Coupling Processes in Circuit QED Lattices, by Won Chan Lee and 7 other authorsView PDFTeX Source view license Current browse context: quant-ph new | recent | 2026-05 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?)