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Q: Fachverband Quantenoptik und Photonik

Q 41: Poster – Quantum Technologies II & Laser Technology

Q 41.16: Poster

Mittwoch, 4. März 2026, 17:00–19:00, Philo 2. OG

A laser system for cooling 87Rb atoms in an optical cavity — •Daniel Reigel, Luis Weiß, Sebastián Alejandro Moralez Ramirez, Raphael Benz, Micha Kappel, Maurizio Trigilia, Vincent Beguin, Leon Layer, Violet Ruf, and Stephan Welte for the QNN collaboration — 5. Physikalisches Institut, Center for Integrated Quantum Science and Technology and CZS Center QPhoton, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

Arrays of neutral atoms at the center of an optical cavity are a promising platform for implementing quantum-coherent network nodes, which can be interconnected using flying optical photons. To prepare such a system, laser-cooling techniques are required to cool the atoms, such that they can be trapped in optical potentials. We present our laser setup for cooling neutral 87Rb atoms in a magneto-optical trap (MOT). This serves as a source of cold atoms for the planned experiments. Our cooling laser is locked to an ultra-low-expansion (ULE) cavity. We describe our locking scheme as well as the subsequent acousto-optic modulators used to tune the lasers to the respective cooling transitions. We also present the development and implementation of a two-dimensional MOT that relies on the laser system described above. In the planned experiments, we aim to generate an intra-cavity atom-tweezer array with individual-atom addressing. We designed a 2D MOT in a glass cell attached to the main chamber. We discuss the design of the components of this MOT, and the mechanical mounting of our dispensers in the glass cell. Finally, we provide an outlook on the planned experiments with the new quantum-network setup.

Keywords: Laser Cooling; Neutral Atoms; Laser Locking; Magneto Optical Trap; Quantum Network Node