Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster – Ultra-cold Atoms, Ions and BEC (joint session A/Q)

Q 27.14: Poster

Tuesday, March 11, 2025, 14:00–16:00, Tent

Quantum Manipulation of Optically Trapped Ions — •Wei Wu, Igor Zhuravlev, Rick Bevers, and Tobias Schaetz — University of Freiburg, Institut of Physics, Hermann-Herder-Strasse 3, Freiburg 79104, Germany

Ions confined in Paul traps provide an exceptional platform for the realization of few-particle systems with high-fidelity control over electronic and motional degrees of freedom, as well as individual addressability. However, extending such precise control to two- or higher-dimensional systems poses significant challenges, primarily due to the presence of driven motion inherent to rf trapping, which introduces decoherence and motional heating. In contrast, optical trapping techniques offer a driven-motion free environment while preserving the long-range Coulomb interactions that are intrinsic property of ion-based systems.

In this work, we demonstrate coherent control of the electronic states of optically trapped Barium ions on the quadrupole transition (6S1/2 -> 5D5/2) using a narrow-linewidth 1762 nm laser system. This system also enables precise spectroscopic resolution of the ions' motional states, facilitating advanced quantum state manipulations. Furthermore, we are studying electronic state dependent confinement of the optically trapped ions and aiming at coherent electronic superposition state and their prospects to allow for investigating superpositions of related electronic structural phase transition from linear ion-chains to 2D zig-zag structures.

Keywords: optically trapped ions; quadrupole transition; quantum manipulation