Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 10: Quantum Technologies – Photon Detectors and Sources
Q 10.5: Talk
Monday, March 2, 2026, 18:00–18:15, P 5
Narrowband frequency-entangled photon source based on a whispering gallery resonator — •Yen-Ju Chen1,2, Sheng-Hsuan Huang1,2, Thomas Dirmeier1,2, Kaisa Laiho3, Dmitry V. Strekalov2, Andrea Aiello2, Gerd Leuchs1,2, and Christoph Marquardt2,1 — 1Chair of Optical Quantum Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstrasse 7/A3, 91058, Erlangen, Germany — 2Max Planck Institute for the Science of Light, Staudtstrasse 2, 91058 Erlangen, Germany — 3German Aerospace Center (DLR e.V.), Institute of Quantum Technologies, Wihelm-Runge-Str. 10, 89081, Ulm, Germany
Frequency-entangled photons have emerged as a powerful tool for advancing quantum technologies, such as sensing. While the generation of highly-nondegenerate frequency-entangled photons have been achieved using non-resonant parametric down-conversion (PDC), the realization of narrowband frequency-entangled states remains an experimental challenge due to the complexity associated with the optical cavity design and control. In this work, we report the realization of a highly-nondegenerate frequency-entangled photon source based on resonant PDC in a whispering gallery resonator (WGR). This approach overcomes existing limitations by leveraging total internal reflection within spherical geometries. Moreover, this WGR device facilitates the generation of a high-brightness photon source, further enhancing its use for quantum applications.
Keywords: parametric down conversion; whispering gallery mode resonator; frequency-entangled photons; Hong-Ou-Mandel interference