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Q: Fachverband Quantenoptik und Photonik

Q 43: QI Poster II (joint session QI/Q)

Q 43.50: Poster

Mittwoch, 8. März 2023, 16:30–19:00, Empore Lichthof

Polarization stabilization of an urban telecom fiber link — •Jonas Meiers, Christian Haen, Stephan Kucera, and Jürgen Eschner — Universität des Saarlandes, Experimentalphysik, 66123 Saarbrücken

Many quantum network designs rely on glass fibers to transmit quantum information encoded into the polarization of photons [1]. Long glass fiber links, especially those deployed outside a laboratory environment are exposed to environmental influences that change the birefringence of the fiber and, as a result, the polarization of transmitted light [2], degrading the polarization-encoded information.

Here, we present the polarization stabilization of a 14 km long urban fiber link running through Saarbrücken, by utilizing lasers as polarization reference and a Gradient-Descent algorithm for error correction. This stabilization provides the necessary transmission process fidelity for quantum communication experiments, which we demonstrate by high-fidelity entanglement distribution with photon pair sources, or by quantum repeater operations.

[1] S. Neumann et al., Nat. Commun. 13, 6134 (2022)

[2] O. Karlsson et al., Journal of Lightwave Technology, 18 (2000)