Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 84: Poster: Quantum Networks

FM 84.14: Poster

Thursday, September 26, 2019, 16:30–18:30, Tents

Efficient single-photon collection for long-distance entanglement of atoms — •Robert Garthoff¹, Tim van Leent¹, Kai Redeker¹, Matthias Seubert¹, Wei Zhang¹, Wenjamin Rosenfeld^1,2, and Harald Weinfurter^1,2 — ¹Fakultät für Physik, Ludwig-Maximilians-Universität, Munich, Germany — ²Planck- Institut für Quantenoptik, Garching, Germany

Photon mediated entanglement between distributed quantum systems forms the basis of future quantum networks and thus will be essential for secure quantum communication and distributed quantum computing. Currently, efficient collection of photons from the quantum memory limits the generation of remote entanglement in entanglement swapping based schemes.

Here we present the details and experimental results of a new setup with optimized photon collection efficiency from a single Rb-87 atom. Using a custom designed high-NA microscope objectives, corrected for our specific experimental geometry, we observe an increase of the collection efficiency by a factor of 2.5. This now enables an improved rate to achieve remote entanglement by a factor of 6, which in turn forms the crucial ingredient to apply frequency conversion to telecom wavelengths in order to efficiently obtain entanglement between quantum memories on a suburban scale.

[1] W. Rosenfeld, Phys. Rev. Lett. 119, 010402 (2017).