Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 3: Quantum Technologies – Enabling Technologies
Q 3.5: Vortrag
Montag, 2. März 2026, 12:45–13:00, P 5
Verification of Electron-Photon Entanglement — •Phila Rembold1, Alexander Preimesberger1,2, Sergei Bogdanov1,2, Santiago Beltrán-Romero1,2, Dennis Rätzel1,2,3, Isobel C Bicket1,2, Elizabeth Agudelo1, Nicolai Friis1, and Philipp Haslinger1,2 — 1Atominstitut, TU Wien, Stadionallee 2, 1020 Vienna, Austria — 2University Service Centre for Transmission Electron Microscopy, TU Wien, Wiedner Hauptstraße 8-10/E057-02, 1040 Vienna, Austria — 3ZARM, University of Bremen, 28359 Bremen, Germany
Entanglement, a central concept in quantum physics, describes correlations between particles that cannot be explained classically. While routinely verified in photonic and atomic systems, direct experimental evidence in transmission electron microscopy (TEM) has been missing. We report the detection of position*momentum entanglement between single free electrons and photons generated via coherent cathodoluminescence in a TEM. The method relies on a general separability bound: for classically correlated particles, the product of the conditional variances in relative position and total momentum cannot fall below a fixed limit. Using coincidence-based ghost imaging, adapted from quantum optics, we measure both spatial and momentum correlations of electron-photon pairs. The observed variance product is significantly below the classical limit, confirming entanglement. This result links the well-developed tools of photonic quantum optics with the capabilities of electron microscopy, offering a route toward quantum-enhanced imaging at the atomic scale.
Keywords: entanglement; electron-photon pair; transmission electron microscope; witness