Erlangen 2022 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 24: Quantum Effects

Q 24.11: Poster

Dienstag, 15. März 2022, 16:30–18:30, P

Sub- and superradiant modes in coupled atomic ring lattices — •Marcel Cech, Beatriz Olmos, and Igor Lesanovsky — Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen, Germany

A hallmark of an open quantum system is its dissipative character, which means that the system loses energy and coherence due to the coupling with its environment. In a many-body system, however, collective effects - such as sub-radiance - allow to suppress excitation and energy loss [1]. We demonstrate this effect in a system of interacting four-level atoms that are coupled to the radiation field. In particular, we focus on ring-shaped lattices which we combine to create meta-structures in the three dimensional space. We consider the properties of these subradient states as a function of the number of rings and their mutual coupling strength. Our analysis shows that for lattice spacings on the order of the wavelength of the atomic transition a subspace of subradiant states emerges, which can be utilized to create lossless excitation transport.

[1] J. A. Needham et al., New. J. Phys. 21 073061 (2019)