Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 70: Quantum Optics

Q 70.1: Vortrag

Freitag, 15. März 2024, 14:30–14:45, HS 3118

Bose-Einstein Condensation of Photons in a Four-Site Quantum Ring — •Andreas Redmann, Christian Kurtscheid, Niels Wolf, Frank Vewinger, Julian Schmitt, and Martin Weitz — Institut für Angewandte Physik, Universität Bonn, Germany

Bose-Einstein condensation can be observed with e.g. ultracold atomic gases, polaritons and since about a decade ago also with low-dimensional photon gases [1]. In recent work with photon gases direct condensation into a coherently split state of light has been realized [2]. Here we report on experimental work directed at realizing thermalized photon gases in periodic potentials of increased complexity, i.e. beyond a double well.

Our experiments use a controlled mirror surface delamination technique to imprint four micro-wells arranged in a ring giving rise to a hybridized ground state for the photon gas [3]. This ring of micro-wells is enclosed by a spherically curved potential providing a manifold of harmonically spaced oscillator levels.

We observe macroscopic accumulation of photons in the ground state when reaching the condensation threshold and the measured spectral photon distribution closely follows a room temperature Bose-Einstein distribution. Using an optical interferometer we probe for the relative phase relation of the emission of the microsites, revealing the relative coherence between the four wells.

[1] J. Klaers et al., Nature 468, 545-548 (2010)

[2] C. Kurtscheid et al., Science 366, 894-897 (2019)

[3] C. Kurtscheid et al., EPL 130, 54001 (2020)

Keywords: BEC; Thermalization; Lattice