Bonn 2025 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 11: Poster – Cold Atoms and Molecules, Matter Waves (joint session Q/A/MO)
A 11.4: Poster
Dienstag, 11. März 2025, 14:00–16:00, Tent
Rydberg superatoms coupled with super-extended evanescent field nanofiber at the single-photon level — •Ludwig Müller1, Knut Domke1, Tangi Legrand1, Thomas Hoinkes2, Xin Wang1, 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 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 will we will present the current status of planning and building our new Nanofiber experiment such as the vacuum chamber and first tests of the nanofibers. 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