Quantum Fisher-information limits of resonant nanophotonic sensors: why high-Q is not optimal even at the quantum limit
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Quantum Physics arXiv:2512.14899 (quant-ph) [Submitted on 16 Dec 2025] Title:Quantum Fisher-information limits of resonant nanophotonic sensors: why high-Q is not optimal even at the quantum limit Authors:J. Sumaya-Martinez View a PDF of the paper titled Quantum Fisher-information limits of resonant nanophotonic sensors: why high-Q is not optimal even at the quantum limit, by J. Sumaya-Martinez View PDF HTML (experimental) Abstract:We develop a quantum metrological framework for resonant nanophotonic sensors based on subwavelength Fabry--Perot slit cavities. Building on classical Fisher-information analyses of resonant transmission sensors, we model parameter encoding as a phase-and-loss quantum channel embedded in one arm of a Mach-Zehnder interferometer. We derive the quantum Fisher information (QFI) for coherent and Gaussian probe states under linear loss and show that, even at the quantum limit, optimal estimation precision is governed by the generator of parameter-dependent phase shifts rather than by the cavity quality factor. Consequently, the operating point that maximizes the QFI does not generally coincide with the maximum-Q resonance. Quantum resources enhance sensitivity but do not redefine the optimal geometry. Our results provide physically transparent design principles for quantum-enhanced nanophotonic sensing. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2512.14899 [quant-ph] (or arXiv:2512.14899v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2512.14899 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Juan Sumaya-Martinez [view email] [v1] Tue, 16 Dec 2025 20:28:25 UTC (22 KB) Full-text links: Access Paper: View a PDF of the paper titled Quantum Fisher-information limits of resonant nanophotonic sensors: why high-Q is not optimal even at the quantum limit, by J. Sumaya-MartinezView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2025-12 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?) Links to Code Toggle Papers with Code (What is Papers with Code?) 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?)