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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster – Quantum Information Technologies (joint session Q/QI)
Q 62.2: Poster
Donnerstag, 13. März 2025, 17:00–19:00, Tent
Characterization and development of the Saarbrücken fiber link for memory-based quantum communication protocols — •Christian Haen1, Max Bergerhoff1, Jonas Meiers1, Stephan Kucera2, and Jürgen Eschner1 — 1Universität des Saarlandes, Experimentalphysik, 66123 Saarbrücken — 2Luxembourg Institute of Science and Technology (LIST), Belveaux, Luxembourg
Deployed telecom glass fiber networks offer a basis for the wide-scale development of quantum networks, but characteristics of existing fibers, such as large loss and arrival time or polarization drifts through environmental exposure, must be addressed.
Previously, we demonstrated and characterized quantum network protocols on a 14-km long urban dark fiber link in Saarbrücken by transmitting photons from an SPDC source [1]. Now, we report on characterizing and developing the fiber link to allow for quantum network protocols using photons emitted by a 40Ca+ single-ion quantum memory, in order to demonstrate atom-photon entanglement and, based on this, device-independent quantum key distribution under realistic conditions.
[1] S.Kucera et al., npj Quantum Inf 10, 88 (2024)
Keywords: Quantum information; Quantum network; Fiber link; Quantum Memory