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Q: Fachverband Quantenoptik und Photonik
Q 57: Quantum Information (Quantum Repeater)
Q 57.2: Vortrag
Freitag, 13. März 2020, 11:30–11:45, e001
Towards a Suburban Quantum Network Link — •Tim van Leent1, Robert Garthoff1, Matthias Bock2, Kai Redeker1, Florian Fertig1, Derya Taray1, Matthias Seubert1, Wei Zhang1, Wenjamin Rosenfeld1,3, Christoph Becher2, and Harald Weinfurter1,3 — 1Fakultät für Physik, Ludwig-Maximilians-Universität, 80799 Munich, Germany — 2Fachrichtung Physik, Universität des Saarlandes, 66123 Saarbrücken, Germany — 3Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
Quantum repeaters will allow scalable quantum networks, which is essential for large scale quantum communication and distributed quantum computing. Yet, still missing on the road towards a quantum repeater, is to achieve entanglement between quantum memories over long distances.
Here we present results demonstrating distribution of atom-photon entanglement at the telecom wavelength over 20 km optical fiber with a fidelity of >79% [1]. For this purpose, we use polarization-preserving quantum frequency conversion, where the photon at 780 nm is mixed with a strong pump field at 1600 nm inside a nonlinear waveguide crystal. Implementing frequency conversion for the second atom and employing the entanglement swapping protocol [2] in the telecom will enable the next important milestone, i.e., generating atom-atom entanglement on a suburban scale.
[1] T. van Leent et al., arXiv:1909.01006 (2019)
[2] W. Rosenfeld et al., Phys. Rev. Lett. 119, 010402 (2017)