Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 21: Quantum Communication III
Q 21.1: Talk
Tuesday, March 12, 2024, 11:00–11:15, HS 3219
Polarization entanglement in whispering gallery resonators — •Sheng-Hsuan Huang1,2, Thomas Dirmeier1,2, Golnoush Shafiee1,2, Kaisa Laiho3, Dmitry Strekalov1, Gerd Leuchs1,2, and Christoph Marquardt1,2 — 1Max-Planck-Institute for the Science of Light, Erlangen, Germany — 2Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany — 3German Aerospace Center (DLR e.V.), Institute of Quantum Technologies, Ulm, Germany
Cavity-assisted spontaneous parametric down conversion (SPDC) sources are a key component to connect different nodes in quantum networks. Sources based on crystalline whispering gallery mode resonators (WGMRs) have been shown to be capable of generating SPDC states that are both narrow-band and single mode[1,2] and interacting efficiently with alkali atoms[3]. However, to our knowledge, polarization entanglement hasn’t been demonstrated in WGMRs.
In our work, we demonstrate the generation of polarization entangled states from a WGMR in an interferometric scheme[4]. Using non-local two-photon interference effects, we demonstrate the generation of genuine entangled states. We also evaluate the S parameter of the CHSH inequality to be 2.45 ± 0.07, which violates the inequality by more than six standard deviations.
[1]J. U. Fürst, et al., Physical review letters 104.15 153901 (2010)
[2]M. Förtsch, et al., Nature communications 4.1 (2013)
[3]G. Schunk, et al., Optica 2.9 (2015)
[4]S-H. Huang, et al., arXiv preprint arXiv:2310.16589 (2023).