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Q: Fachverband Quantenoptik und Photonik

Q 63: Poster – Quantum Information (joint session QI/Q)

Q 63.14: Poster

Donnerstag, 13. März 2025, 17:00–19:00, Tent

A quantum-network register assembled with optical tweezers in an optical cavity — •Matthias Seubert¹, Lukas Hartung¹, Stephan Welte^1,2, Emanuele Distante^1,3, and Gerhard Rempe¹ — ¹Max-Planck-Institute of Quantum Optics, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany — ²5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — ³CFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain

Quantum networks offer great potential for secure communication, distributed computing, and precision sensing. However, optical losses and errors between distant nodes make quantum information exchange slow and unreliable. One solution is to use more qubits as a register at each node, allowing multiplexed communication and error correction.

We present recent results [1] demonstrating the potential of a platform that integrates optical tweezer arrays with a macroscopic optical cavity for scalable quantum network nodes. By assembling one- and two-dimensional registers of up to 6 atoms, we address each individual atom to generate atom-photon entanglement via vacuum-stimulated Raman adiabatic passages. As the number of qubits in the register increases, the entanglement fidelity remains constant, an indication of scalability. By generating atom-photon entanglement in a multiplexed manner, we achieved a source-to-detection probability of up to ∼90% per run. This is an important step towards the deterministic distribution of entanglement in networks.

[1] L. Hartung et al. Science Vol 385, Issue 6705 pp. 179-183 (2024)

Keywords: Quantum Network; Tweezer Array; Optical Cavity