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Q: Fachverband Quantenoptik und Photonik

Q 38: Poster IV

Q 38.20: Poster

Mittwoch, 13. März 2024, 17:00–19:00, KG I Foyer

Coherent control of ion motion via Rydberg excitation — •Marion Mallweger1, Andre Cidrim2, Harry Parke1, Natalia Kuk1, Robin Thomm1, Chi Zhang1, and Markus Hennrich11Stockholm University, Stockholm, Sweden — 2Universidade Federal de São Carlos, São Carlos, Brazil

Trapped Rydberg ions are a novel approach to quantum information processing, combining qubit rotations in the ions’ ground states with entanglement operations via Rydberg interaction. In the experiments presented here a trapped strontium ion was excited from the metastable 4D to Rydberg states. While for the ground state of the ion, the polarizability is negligible, for Rydberg ions it increases as ∼ n7. Thus, the high polarizability of the Rydberg state with respect to the ground state leads to a displaced trapping potential during the Rydberg excitation if the ion experiences an offset electric field. We explore how this trapping field displacement can be employed for coherent control of the ions’ motion. We investigate this effect by performing coherent excitation of the ion to the Rydberg state by using stimulated Raman adiabatic passage (STIRAP). Repeated transitions between the ground and the Rydberg states enhances the effect of the ion displacement due to the change in trapping potential. This can be used to induce a geometric phase accumulation via the ion motion. This excitation of motional modes via Rydberg excitation and the generation of geometrical phases could be utilized for realizing a fast quantum phase gate between multiple ions.

Keywords: Trapped ions; Motion; Rydberg

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DPG-Physik > DPG-Verhandlungen > 2024 > Freiburg