Multi-parameter two-photon polarimetry at the quantum limit
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Quantum Physics arXiv:2606.27428 (quant-ph) [Submitted on 25 Jun 2026] Title:Multi-parameter two-photon polarimetry at the quantum limit Authors:Joseph Niblo, Luca Maggio, Russell M. J. Brooks, Joseph Ho, Vincenzo Tamma, Alessandro Fedrizzi View a PDF of the paper titled Multi-parameter two-photon polarimetry at the quantum limit, by Joseph Niblo and 5 other authors View PDF HTML (experimental) Abstract:Photonic quantum metrology has demonstrated advantages in precision and resource efficiency for a wide range of applications, with several schemes approaching the fundamental quantum Cramér-Rao precision bound (QCRB). However, the intrinsic incompatibility of quantum measurements represents a hurdle in extending these advantages to the simultaneous estimation of multiple parameters. In this paper, we present an experimental protocol approaching the QCRB simultaneously in two polarisation parameters, across a wide range of the parameter space, with as few as $\sim 200$ photon pairs, offering advantages for polarimetric sensing for dim sources such as in X-ray astronomy or photosensitive samples. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2606.27428 [quant-ph] (or arXiv:2606.27428v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2606.27428 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Joseph Niblo [view email] [v1] Thu, 25 Jun 2026 18:00:05 UTC (552 KB) Full-text links: Access Paper: View a PDF of the paper titled Multi-parameter two-photon polarimetry at the quantum limit, by Joseph Niblo and 5 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-06 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?)