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

• URL: http://arxiv.org/abs/2603.16235v1
• Date: Tue, 17 Mar 2026 08:22:07 GMT
• Title: Two-Dimensional Far-Field Correlations of X-ray Photon Pairs
• Abstract summary: We observe far-field correlations of x-ray photon pairs generated by spontaneous parametric down-conversion (SPDC)<n>The ring radii scale with photon energy, in quantitative agreement with transverse phase matching, providing a stringent momentum-space validation of x-ray SPDC.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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.

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