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Q: Fachverband Quantenoptik und Photonik

Q 16: Quantum Optics

Q 16.7: Poster

Donnerstag, 23. September 2021, 16:30–18:30, P

Rydberg quantum optics in an ultracold Rubidium gas — •Nina Stiesdal^1,2, Hannes Busche¹, Alireza Aghabababaie¹, Lukas Alheit¹, Cedric Wind¹, and Sebastian Hofferberth¹ — ¹Institute für Angewandte Physik, University of Bonn — ²Institute for Physics, Chemistry and Pharmacy, University of Southern Denmark

Mapping the strong interaction between Rydberg excitations in ultracold atomic ensembles onto single photons enables the realization of optical nonlinearities which can modify light on the level of individual photons. This approach forms the basis of a growing Rydberg quantum optics toolbox, which already contains photonic logic building-blocks such as single-photon sources, switches, transistors, and two-photon gates.

Here we discuss how we experimentally implement a 1d chain of Ryderg superatoms, each formed by an individually trapped atomic cloud containing ca. N=10000 atoms. With this system we can study the dynamics of single two level systems strongly coupled to quantized propagating light fields. The directed emission of the superatoms back into the probe mode makes this free-space chain of superatoms identical to emitters coupled to a 1d optical waveguide, thus realizing a cascaded quantum system coupled to a single probe mode. This has recently allowed us to realize a multi-photon subtractor, which we present here.