Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 24: Poster II

Q 24.41: Poster

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

Rydberg superatoms for waveguide QED — •Daniil Svirskiy, Lukas Ahlheit, Christoph Biesek, Jan de Haan, Nina Stiesdal, Wolfgang Alt, and Sebastian Hofferberth — Institute of Applied Physics, University of Bonn, Germany

Waveguide-systems where quantum emitters are strongly coupled to a single propagating light mode offer an interesting platform for quantum nonlinear optics. We work towards realizing a cascaded waveguide system utilizing Rydberg superatoms - single Rydberg excitations in individual atomic ensembles smaller than the Rydberg blockade-volume - as effective, directional two-level emitters. Due to the collective nature of the excitation, the superatom effectively represents a single emitter, that is coupled to the inicdent single photon light. The directional emission of the superatom into the initial probe mode realizes a waveguide-like system in free space without any actual light-guiding elements.

On this poster, we show how a Rydberg superatom allows manipulation of single photons, and demonstrate how we implement a one-dimensional chain of Rydberg superatoms with low internal dephasing. To increase coherence time, we use a magic wavelength optical lattice that traps atoms in both the ground- and the Rydberg state and thus reduce atomic motion and limit dephasing of the collective excitation.

We further show how we use an interferometer setup to perform quantum state tomography on multi-photon pulses passing through the superatoms in order to characterize the effective photon-photon interaction mediated by the superatom chain.

Keywords: Waveguide QED; Rydberg blockade; Rydberg superatom; Interferometry