Mainz 2026 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 60: Quantum Communication, Networks, Repeaters, & QKD II
Q 60.7: Vortrag
Donnerstag, 5. März 2026, 16:15–16:30, P 10
Connecting Neutral-Atom Quantum Nodes across a metropolitan fiber link — •Tobias Frank1, Pooja Malik2, Maya Büki1, Gianvito Chiarella1, Florian Fertig2, Yiru Zhou2, Pau Farrera1,3, Harald Weinfurter1,2, and Gerhard Rempe1 — 1Max Planck Institute of Quantum Optics, Garching, Germany — 2Ludwig-Maximilians-University, Munich, Germany — 3Munich Center for Quantum Science and Technology (MCQST), Munich, Germany
Neutral atoms are promising candidates for quantum networking due to their long coherence times, uniform optical transitions, and efficient light-matter interfaces. A central challenge is distributing high-fidelity entanglement between remote network nodes over metropolitan fiber links, where loss and environmental noise are significant.
We address this by interconnecting two neutral-atom quantum nodes via a 23.7 km deployed telecom fiber link in the Munich metropolitan area. Using active polarization stabilization and quantum frequency conversion to the telecom S-band at the sender, we distribute atom-photon entanglement with minimal transmission loss. At the receiver, telecom photons are back-converted to 780 nm and stored in a passively heralded memory, providing a low-noise indication of successful storage. With Spin-echo techniques we extend the memory coherence time, while using microwave qubit rotations combined with fluorescence-based detection we can enhance the readout efficiency, both essential requirements for high-fidelity entanglement distribution between the two distant nodes.
Keywords: Quantum Network; Entanglement distribution; Quantum Memory; Quantum Frequency Conversion; Quantum link