Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 44: Quantum Networks (joint session QI/Q)
Q 44.8: Vortrag
Mittwoch, 12. März 2025, 16:30–16:45, HS VIII
Towards a Suburban Quantum Network Link — •Pooja Malik1,2, Florian Fertig1,2, Yiru Zhou1,2, Tommy Block1,2, Maya Bueki3, Tobias Frank3, Gianvito Chiarella3, Marvin Scholz3, Pau Ferrera3, Gerhard Rempe3, and Harald Weinfurter1,2,3 — 1Fakultät für Physik, Ludwig- Maximilians-Universität, Munich, Germany — 2Munich Center for Quantum Science and Technology (MCQST), Munich, Germany — 3Max-Planck Institut für Quantenoptik, Garching, Germany
Distributed quantum computing, quantum sensing and secure quantum communication are all much anticipated applications of quantum networks. The primary blocks of these networks are quantum nodes and the foremost task is to distribute entanglement between distant quantum nodes. Here we present a quantum node based on a single Rb87 atom capable of distributing entanglement between a single atom and a single photon over a 23 km deployed telecom fiber. To achieve transfer in commercial fiber network the single photons are converted to telecom wavelength to evade high attenuation loss at 780 nm. With active polarization compensation over the deployed fiber and long atomic coherence time of 7 ms [1] we measure atom-photon entanglement fidelity of more than 80%. This is a crucial step to realize a city-to-city scale quantum network link when, in the future, connecting to another Rb87 atom node at the remote end of fiber link [2]. [1] Y. Zhou et al., PRX Quantum 5, 020307, 2024 [2] M. Brekenfeld et al., Nature Physics 16, 647-651 (2020)
Keywords: Quantum networks; Single Atom; Entanglement distribution