SAMOP 2023 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 8: Quantum Communication I (joint session Q/QI)
QI 8.4: Vortrag
Montag, 6. März 2023, 17:45–18:00, F442
Quantum communication protocols over a 14 km urban fiber link — •Stephan Kucera, Elena Arenskötter, Christian Haen, Jonas Meiers, Tobias Bauer, and Jürgen Eschner — Universität des Saarlandes, Experimentalphysik, 66123 Saarbrücken
The application of existing telecom-fiber infrastructure for quantum communication protocols enables efficient development of quantum networks [1]. It also entails multiple challenges, since existing infrastructure in an urban region is often underground, or paired with the electrical overhead power line.
We report on the implementation of entanglement distribution and quantum-state teleportation over a 14 km polarization-stabilized urban dark-fiber link, which is partially underground, partially overhead, and patched in several stations. Using a type-II cavity-enhanced SPDC photon-pair source, a 40Ca+ single-ion quantum memory whose transition matches the source, and quantum frequency conversion to the telecom C-band of one photon of a pair [2], we demonstrate photon-photon entanglement, ion-photon entanglement, and teleportation of a qubit state from the ion onto the remote telecom photon, all realized over the urban fiber link.
[1] H. Kimble, Nature 453, 1023*1030 (2008)
[2] E. Arenskötter et al., arXiv:2211.08841 (2022)