Bonn 2025 – scientific programme
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QI: Fachverband Quanteninformation
QI 31: Quantum Sensing II (joint session Q/QI)
QI 31.4: Talk
Thursday, March 13, 2025, 12:00–12:15, HS I PI
Probing free-electron-photon entanglement with quantum eraser experiments — •Jan-Wilke Henke1,2, Hao Jeng1,2, and Claus Ropers1,2 — 1Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany — 2University of Göttingen, 4th Physical Institute, Göttingen, Germany
Quantum entanglement is central to most emerging quantum technologies including quantum computation and sensing. While the interaction of free electrons with optical fields is expected to induce free electron-photon entanglement [1,2], its demonstration remains an outstanding challenge.
In this presentation, we propose a tangible experiment for generating and verifying quantum entanglement between free electrons and photons based on quantum erasure [3]. We introduce the basic concept, before describing possible implementations employing multiple electron beams in an electron microscope and demonstrating selected experimental key aspects. Finally, we discuss extending this scheme to entanglement tests and generating electron-electron entanglement. Such a demonstration of electron-photon entanglement will be a cornerstone of free electron quantum optics and could enable quantum-enhanced sensing in electron microscopy.
[1] O. Kfir, Phys. Rev. Lett. 123, 103602 (2019); [2] A. Konecńa, F. Iyikanat, and F. J. García de Abajo, Sci. Adv. 8, eabo7853 (2022); [3] J.-W. Henke, H. Jeng & C. Ropers, arXiv:2404.11368 (2024)
Keywords: Quantum entanglement; Electron microscopy; Hybrid quantum systems; Electron-driven photon generation