Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 24: Poster II
Q 24.43: Poster
Tuesday, March 12, 2024, 17:00–19:00, KG I Foyer
Rydberg superatoms coupled with super-extended evanescent field nanofiber at the single-photon level — •Tangi Legrand1, Ludwig Müller1, Thomas Hoinkes2, Xin Wang1, Thilina Muthu-Arachchige1, Eduardo Uruñuela1, Wolfgang Alt1, and Sebastian Hofferberth1 — 1Institute of Applied Physics, University of Bonn, Germany — 2Department of Physics, Humboldt University of Berlin, Germany
Both Rydberg superatoms driven by free-space photonic modes and single emitters coupled to photonic waveguides have paved the way for strong coherent light-matter coupling at the few-photon level. By combining advantages of both ideas, we aim to achieve homogeneous coupling of multiple Rydberg superatoms coupled to a field thighly confined by a nanofiber. Fibers with diameters of a few hundred nanometers are successfully used to trap and couple arrays of single atoms by their evanescent field. Recent advances allow the fibers to be tapered to even smaller diameters, allowing more than 99 % of the energy to be guided outside the fiber with effective field diameters of 13 λ [1], bringing them up to typical Rydberg blockade radius sizes.
On this poster, we present our strategy for building an apparatus that allows multiple Rydberg superatoms to be trapped around a nanofiber with a diameter of about 100 nm. We select Ytterbium due to its advantage of having the two-photon Rydberg excitation transitions close together with 399 nm and 395 nm, which simplifies the fiber design and is expected to have low thermal dephasing effects.
[1] R. Finkelstein et. al. Optica 8, 208-215 (2021)
Keywords: Waveguide QED; Ultracold Ytterbium; Rydberg superatoms; Nanofiber