Simultaneous amplitude and phase spectroscopy using two-photon interference
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Quantum Physics arXiv:2603.15944 (quant-ph) [Submitted on 16 Mar 2026] Title:Simultaneous amplitude and phase spectroscopy using two-photon interference Authors:Kyle M. Jordan (1,2,3), Yingwen Zhang (1,2,3), Frédéric Bouchard (1), Duncan England (1), Philip J. Bustard (1), Benjamin J. Sussman (1,2,3), Jeff S. Lundeen (2,3), Andrew H. Proppe (1,2,3) ((1) National Research Council Canada, (2) Department of Physics and Nexus for Quantum Technology, University of Ottawa, (3) University of Ottawa-NRC Joint Center for Extreme Photonics) View a PDF of the paper titled Simultaneous amplitude and phase spectroscopy using two-photon interference, by Kyle M. Jordan (1 and 19 other authors View PDF Abstract:Quantum spectroscopy seeks to probe chemical systems using nonclassical light, which has properties that are qualitatively and quantitatively different than conventional light sources. One promising technique uses intensity-correlated twin beams of light to reduce the noise sources inherent to absorption spectroscopy. However, measurements of the phase shift imparted by the chemical sample, which provides complementary information to the absorption, continue to be a challenge. Here, we propose and demonstrate a scheme using entangled photon pairs that can simultaneously measure both the absorption and phase shift of a sample with extremely low optical intensities and with relatively fast few-minute acquisition times. This method combines the previous use of intensity correlations with a broadband quantum interferometer utilizing two-photon interference to measure the complete linear optical response of the sample. Our work shows that precise measurements of absorption can also be made phase-sensitive using suitable choices of probe beam and detection scheme. This enables a new class of quantum spectroscopy schemes which measure absorption and phase with a single probe. Our technique is relevant to the characterization of a wide array of chemical and biological samples, such as quantum dots and organic fluorophores, and may be useful for spectroscopic measurements that are otherwise constrained in intensity. Comments: Subjects: Quantum Physics (quant-ph); Optics (physics.optics) Cite as: arXiv:2603.15944 [quant-ph] (or arXiv:2603.15944v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2603.15944 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Kyle Jordan [view email] [v1] Mon, 16 Mar 2026 21:50:35 UTC (790 KB) Full-text links: Access Paper: View a PDF of the paper titled Simultaneous amplitude and phase spectroscopy using two-photon interference, by Kyle M. Jordan (1 and 19 other authorsView PDF view license Current browse context: quant-ph new | recent | 2026-03 Change to browse by: physics physics.optics 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?)