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Q: Fachverband Quantenoptik und Photonik

Q 17: Quantum Effects

Q 17.13: Poster

Donnerstag, 23. September 2021, 16:30–18:30, P

Strong interaction between free electrons and high-Q whispering gallery modes — •Jan-Wilke Henke^1,2, Arslan S. Raja³, Armin Feist^1,2, Guanhao Huang³, Germaine Arend^1,2, Yujia Yang³, F. Jasmin Kappert^1,2, Rui Ning Wang³, Marcel Möller^1,2, Jiahe Pan³, Junqiu Liu³, Ofer Kfir^1,2, Tobias J. Kippenberg³, and Claus Ropers^1,2 — ¹Max Planck Institute for Biophysical Chemistry, Göttingen, Germany — ²4th Physical Institute, University of Göttingen, Göttingen, Germany — ³Swiss Federal Institute of Technology Lausanne, Lausanne, Switzerland

Achieving strong coupling of electron beams with single photons promises advancements in quantum optics with free electrons and will enable observation of effects like cavity photon-mediated electron-electron entanglement.

Here, we demonstrate the interaction of a free-electron beam with a single, continuous wave-pumped optical mode of a chip-based silicon nitride microresonator [1]. Employing resonant enhancement, which allows for achieving unity electron-photon scattering efficiency at unprecedentedly low optical pump powers, we observe electron-light phase matching of the interaction. Finally, we discuss the prospect of electron-mediated photon generation and entanglement.

This combination of integrated photonics with electron microscopy enables tailoring of the electron-light interaction, which paves the way to experiments in the strong-coupling regime.

[1] J.-W. Henke, A. S. Raja, et al., preprint, arXiv:2105.03729 (2021)