Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 2: Quantum Networks, Repeaters, and QKD I (joint session Q/QI)

Q 2.1: Invited Talk

Monday, March 10, 2025, 11:00–11:30, AP-HS

An array of neutral atoms coupled to an optical cavity: A versatile quantum network node — Raphael Benz, Sebastián Alejandro Morales Ramirez, Micha Kappel, Vincent Beguin, Krishna Relekar, and •Stephan Welte — 5. Physikalisches Institut, Center for Integrated Quantum Science and Technology and CZS Center QPhoton, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

I will present the plans of a recently established research group in Stuttgart focused on developing multi-qubit quantum network nodes. Our approach leverages an array of tweezer-trapped atomic qubits positioned at the center of a high-finesse optical cavity. All atoms in the array are positioned to ensure strong coupling to the cavity, thus establishing a connection to a photonic quantum channel. I will discuss the prospects of this system as a versatile quantum network node for both quantum computation and communication. Employing the system, a series of experiments is envisioned. I will outline these experiments, including photon-mediated quantum information processing between the intra-cavity atoms, the generation of photonic cluster states, and the generation of optical Gottesman-Kitaev-Preskill qubits. Finally, I will outline the prospects of connecting several atom-cavity systems in a quantum internet architecture.

Keywords: Quantum Network Node; Quantum Communication; Cavity QED; Trapped Neutral Atoms; Optical Tweezers