Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 24: Poster II

Q 24.2: Poster

Dienstag, 12. März 2024, 17:00–19:00, KG I Foyer

Realization of Effective Interactions in Bose-Einstein Condensates of Photons — •Niels Wolf, Andreas Redmann, Christian Kurtscheid, Frank Vewinger, Julian Schmitt, and Martin Weitz — Institut für Angewandte Physik, Universität Bonn, Wegelerstr. 8, D-53115 Bonn, Germany

Bose-Einstein condensation can be observed with ultracold atomic gases, polaritons, and since about a decade ago also with low-dimensional photon gases. In atomic Bose-Einstein condensates thermal equilibrium is obtained by inter-particle collisions. Since photon-photon interactions remain vanishingly small in the experimental cavity system, thermalization of photons is achieved via thermal contact of the photons with molecules in liquid solution filled into a microcavity [1]. Nevertheless, via strong photon-photon interaction, i.e. a Kerr-interaction, lattices of photon gases could in future enable the creation of highly entangled resource states for multiple partner quantum connectivity [2].

Our experiment uses a triply resonant optical parametric oscillator setup, which independently controls cavities for the pump and subharmonic wavelength respectively. In this way, a Kerr-nonlinearity originating from cascaded second order nonlinearities to subharmonics of the incident optical radiation has been experimentally demonstrated.

[1] J. Klaers et al., Nature 468, 545 (2010) [2] C. Kurtscheid et al., Science 366, 894 (2019)

Keywords: Photon Bose-Einstein Condensation; Triply Optical Parametric Oscillator; Effective Photon-Photon Interactions; Kerr-Nonlinearity; Cascaded Second Order Nonlinearities