Two-Dimensional Far-Field Correlations of X-ray Photon Pairs

Quantum Physics [Submitted on 17 Mar 2026] Two-Dimensional Far-Field Correlations of X-ray Photon Pairs E. Strizhevsky, Y. Klein, R. Hartmann, S. Francoual, T. Schulli, T. Zhou, A. Sharma, U. Pietsch, L. Strüder D. Altamura, C. Giannini, M. Shokr, S. Shwartz We directly observe far-field correlations of x-ray photon pairs generated by spontaneous parametric down-conversion (SPDC). Using an energy-resolved, two-dimensional photon counting detector we record the full ring-shaped emission of both photons across a broad bandwidth and extract pair correlations directly from raw events without imposing angular constraints. The ring radii scale with photon energy, in quantitative agreement with transverse phase matching, providing a stringent momentum-space validation of x-ray SPDC. These observations open a route to leveraging quantum correlations in x-ray imaging and metrology, including correlation-enhanced magnification and reduced blurring. Comments: 16 pages, 7 figures, 2 tables Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2603.16235 [quant-ph]   (or arXiv:2603.16235v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2603.16235 Focus to learn more Submission history From: Sharon Shwartz [view email] [v1] Tue, 17 Mar 2026 08:22:07 UTC (1,005 KB) Access Paper: view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-03 References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation 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 Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)