Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 29: Ultra-cold Atoms, Ions and BEC III (joint session A/Q)

A 29.2: Talk

Thursday, March 14, 2024, 14:45–15:00, HS 1010

Circular Rydberg qubits of alkaline earth atoms in optical tweezers — •Einius Pultinevicius, Christian Hölzl, Aaron Götzelmann, Moritz Wirth, and Florian Meinert — 5th Institute of Physics, Universität Stuttgart, Stuttgart, Germany

We report the first demonstration of trapped circular Rydberg states of an alkaline-earth metal atom (Strontium) in an optical tweezer array. Circular Rydberg states promise orders of magnitude longer lifetimes compared to their low-L counterparts, which allows for overcoming fundamental limitations in the coherence properties of Rydberg atom based quantum simulators and quantum computers. In our experiments, we utilize tweezer trapped Strontium atoms and demonstrate efficient transfer into high-n circular Rydberg atoms with n=79 via rapid adiabatic passage. We implement a qubit between circular states of closeby hydrogenic manifolds coupled via a two-photon microwave transition and study its coherence via Rabi and Ramsey measurements. We also demonstrate trapping of the circular state enabled via the second available valence electron of the Sr atom. Our results open exciting prospects for exploiting unique properties of long-lived circular states of two-valence electron atoms, comprising coherent core excitation, for quantum technologies.

Keywords: Circular Rydberg States; Alkaline-Earth; Quantum Simulation; Tweezer