Tunable nonlinear electromechanics at the zero-point motion scale

Quantum Physics arXiv:2607.21764 (quant-ph) [Submitted on 23 Jul 2026] Title:Tunable nonlinear electromechanics at the zero-point motion scale Authors:Christoffer B. Møller, Roger Tormo-Queralt, Elsa Vázquez-Rodríguez, Victor Román-Rodríguez, Marta Cagetti, Eneko Mateos-Madinabeitia, Janine C. Franz, Stefan Forstner, Sergio L. De Bonis, Luca Ornago, Maria El Abbassi, Seoho Jung, Andrew N. Cleland, David A. Czaplewski, Fabio Pistolesi, Adrian Bachtold View a PDF of the paper titled Tunable nonlinear electromechanics at the zero-point motion scale, by Christoffer B. M{\o}ller and 15 other authors View PDF HTML (experimental) Abstract:Nonlinearity at the scale of zero-point motion opens new possibilities for the control and readout of nanomechanical systems, but achieving this remains a formidable challenge. Here we demonstrate that ultrastrong coupling (USC) between a nanotube mechanical oscillator and a double-quantum-dot electronic two-level system enables a mechanical Kerr (Duffing) nonlinearity at the zero-point motion scale. In the dispersive regime, this large coupling yields a mechanical anharmonicity of $\alpha = 1.4\%$ - three orders of magnitude larger than in previous work - while preserving the predominantly mechanical nature of the lowest energy states. We further demonstrate a purely quadratic cavity-based continuous readout of the mechanical motion. This continuous nonlinear optomechanical readout is enforced by a double-quantum dot symmetry, which can be broken by gate tuning to introduce a large linear transduction. These results establish a tunable USC platform that enables strong mechanical anharmonicity and nonlinear continuous readout at the zero-point motion scale. Subjects: Quantum Physics (quant-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Cite as: arXiv:2607.21764 [quant-ph] (or arXiv:2607.21764v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2607.21764 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Christoffer Møller [view email] [v1] Thu, 23 Jul 2026 19:27:33 UTC (14,583 KB) Full-text links: Access Paper: View a PDF of the paper titled Tunable nonlinear electromechanics at the zero-point motion scale, by Christoffer B. M{\o}ller and 15 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-07 Change to browse by: cond-mat cond-mat.mes-hall 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?)