Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 41: Poster: Quantum Optics and Photonics II
Q 41.28: Poster
Wednesday, March 13, 2019, 16:15–18:15, S Fobau Physik
Towards a Suburban Quantum Network Link — •Tim van Leent1, Robert Garthoff1, Kai Redeker1, Paul Koschmieder1, Wei Zhang1, Wenjamin Rosenfeld1,2, and Harald Weinfurter1,2 — 1Fakultät für Physik, Ludwig-Maximilians-Universität, Munich, Germany — 2Max-Planck-Institut für Quantenoptik, Garching, Germany
Quantum repeaters will allow scalable quantum networks, which is essential for large scale quantum communication and distributed quantum computing. Yet, one of the experimental challenges is still to achieve entanglement between quantum memories over long distances.
Here we describe an experimental setup which employs the entanglement swapping protocol to generate entanglement between two Rubidium 87 atoms, currently separated by a distance of 400 meters [1]. We report on results increasing this distance by at least an order of magnitude with the goal, for example, to establish a quantum network link between down-town Munich and Garching (14 km).
Essential steps in this process are first implementing a quantum frequency converter using a nonlinear waveguide crystal in a Sagnac-type interferometer configuration [2,3]. Second, improving the collection efficiency of the emitted photons with a custom made microscope (NA 0.5), which will increase the atom-atom entanglement rate by at least an order of magnitude.
[1] W. Rosenfeld et al., Phys. Rev. Lett. 119, 010402 (2017)
[2] M. Bock et al., Nat. Comm. 9, 1998 (2018)
[3] R. Ikuta et al., Nat. Comm. 9, 1997 (2018)