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QI: Fachverband Quanteninformation

QI 2: Implementations I

QI 2.6: Vortrag

Montag, 9. März 2026, 11:30–11:45, BEY/0245

A Free-Electron-Driven Quantum Light Source — •Armin Feist^1,2, Guanhao Huang^3,4, Germaine Arend^1,2, Yujia Yang^3,4, Jan-Wilke Henke^1,2, Zheru Qiu^3,4, Hao Jeng^1,2, Arslan Sajid Raja^3,4, Rudolf Haindl^1,2, Rui Ning Wang^3,4, Tobias J. Kippenberg^3,4, and Claus Ropers^1,2 — ¹Max Planck Institute for Multidisciplinary Sciences, Göttingen, DE — ²4th Physical Institute, University of Göttingen, DE — ³Institute of Physics, EPFL, Lausanne, CH — ⁴Center for Quantum Science and Engineering, EPFL, Lausanne, CH

Tailored nonclassical light is essential for photonic quantum technologies, yet generating complex optical states remains challenging. Inelastic free-electron scattering offers a promising new method for creating parametric and wavelength-tunable quantum light, particularly through coherent cathodoluminescence.

Here, we present a novel platform that efficiently couples free-electron beams to silicon nitride integrated photonics [1], enabling the generation of electron-photon pair states [2]. By post-selecting electrons with quantized energy loss, we can herald nonclassical single and multi-photon states [2,3]. This establishes a versatile source of tailored quantum light, potentially leading to a new class of hybrid quantum technology that combines electrons and photons.

[1] J.-W. Henke et al., Nature 600, 653 (2021) [2] A. Feist et al., Science 377, 777 (2022) [3] G. Arend et al., Nat. Phys. 21, 1855 (2024)

Keywords: free-electron quantum optics; quantum light source; single photon source; coherent cathodoluminescence; integrated photonics