Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 68: Quantum Computing and Simulation II

Q 68.4: Talk

Friday, March 15, 2024, 15:15–15:30, HS 1199

Implementation of a scalable quantum network node — •Matthias Seubert¹, Lukas Hartung¹, Stephan Welte², Emanuele Distante¹, and Gerhard Rempe¹ — ¹Max- Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching — ²ETH Zürich, Otto-Stern-Weg 1, 8093 Zürich

For many envisioned applications of quantum networks, efficient and scalable quantum nodes are needed. A promising candidate are single neutral atoms trapped at the center of an optical resonator. While this architecture has proven its capabilities for storing and processing quantum information [1], probabilistic loading limits the number of individual controllable qubits to two. Optical tweezers by contrast, have demonstrated deterministic loading and a high degree of scalability [2].

In this talk, we show the merging of an optical cavity setup in the strong coupling regime with an optical tweezers setup. ⁸⁷Rb atoms are loaded at the center of a resonator and transferred into an optical tweezers array. Exploiting movable tweezers, individual atoms are rearranged in predefined atomic patterns with sub-wavelength precision. Afterwards we load the atoms into a 2D optical lattice. In this manner, we show a significant increase of preparing a deterministic number of simultaneously coupled atoms at predefined positions. Furthermore, we demonstrate the addressing capabilities of our setup by consecutively generating photons from individual atoms. In the future, this setup will be used to efficiently generate atom-photon entanglement.

[1] A. Reiserer and G. Rempe, Rev. Mod. Phys. 87, 1379 (2015)

[2] D. Barredo et al., Science 354, 6315 (2016)

Keywords: Cavity; Tweezer; Quantum network