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TUE: Tuesday Contributed Sessions

TUE 7: Entanglement and Complexity: Contributed Session to Symposium I

TUE 7.1: Vortrag

Dienstag, 9. September 2025, 14:15–14:30, ZHG008

Experimental Demonstration of Electron-Photon Entanglement — •Sergei Bogdanov^{1, 2}, Alexander Preimesberger^{1, 2}, Isobel C. Bicket^{1, 2}, Phila Rembold¹, and Philipp Haslinger^{1, 2} — ¹Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Vienna, Austria — ²University Service Centre for Transmission Electron Microscopy (USTEM), TU Wien, Vienna, Austria

Quantum entanglement, a fundamental resource for quantum technologies, describes correlations between particles that cannot be explained by classical physics. While transmission electron microscopes (TEMs) are well-established tools with exceptional spatial resolution, their potential for exploring quantum correlations remains largely underexplored. In this study, we demonstrate entanglement between electrons and photons generated via cathodoluminescence inside a TEM. To produce correlated electron-photon pairs we use a TEM working at 200 keV to illuminate a 50 nm silicon membrane. Inelastic scattering of electrons may lead to the emission of cathodoluminescent coherent photons. Due to energy and momentum conservation, transmitted electrons and emitted photons are correlated in position and momentum. A custom-made parabolic mirror directs the photons out of the TEM to an optical detection system. To perform coincidence measurements, an absorptive grating mask is used as the object for ghost image formation. We reconstruct near- and far-field "ghost" images of the periodic masks and show a violation of the classical uncertainty bound. Hence, we demonstrate position-momentum entanglement of electron-photon pairs, bridging quantum optics and electron microscopy.

Keywords: Quantum Entanglement; Electron Microscopy; Ghost Imaging; Correlation Measurements; Electron-Photon Pairs