Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 4: Rydberg Atoms, Ions, and Molecules (joint session Q/MO)
Q 4.2: Vortrag
Montag, 10. März 2025, 11:15–11:30, HS I
Magic wavelength traps for collective Rydberg excitations — •Daniil Svirskiy1, Lukas Ahlheit1, Chris Nill2, Jan de Haan1, Nina Stiesdal1, Wolfgang Alt1, Igor Lesanovsky2, and Sebastian Hofferberth1 — 1Institute of Applied Physics, University of Bonn, Germany — 2Institute of Theoretical Physics, University of Tübingen, Germany
Storage of optical photons as collective excitation in an ultracold atomic medium is one of the possible candidates for the realization of a quantum memory. However, photon storage times are limited by various decoherence mechanisms, including thermal atomic motion and inhomogeneous differential light shifts between atoms sharing the excitation. The latter can be suppressed by magic trapping, which equalizes the AC Stark shifts for the ground and excited levels of the atom.
In this talk, I present our implementation of a magic trap for ultracold Rydberg atoms. We conduct photon storage and retrieval measurements for two different trapping geometries: a magic lattice and a running wave trap with different trap wavelengths. Our experiments demonstrate that both the longitudinal standing wave and the radial trap shape impact the magic condition. This difference arises from the Rydberg electron wavefunction extending over a significant region of the trap potential and contributing a ponderomotive part to the trap potential. We investigate how this part scales with principle quantum number n and determine the optimal magic lattice wavelength for each Rydberg state.
Keywords: Rydberg atoms; EIT; Photon storage; Magic wavelength trap