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Q: Fachverband Quantenoptik und Photonik
Q 19: Quantum Information (Quantum Repeater) I
Q 19.4: Vortrag
Montag, 11. März 2019, 17:00–17:15, S HS 001 Chemie
Efficient single-photon collection for long-distance entanglement of atoms — •Robert Garthoff1, Tim van Leent1, 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
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. The only suitable candidate to interconnect separate quantum memories are photons. Currently, efficient collection of photons from the quantum memory limits the generation of remote entanglement in schemes based on entanglement swapping.
Here we present the experimental details and results of the optimization of the photon collection efficiency from a single trapped Rb-87 atom used as a quantum memory. Using custom designed microscope objectives with a high numerical aperture and corrected for our specific experimental geometry, we expect at least a threefold increase of the collection efficiency and thereby an improvement of remote entanglement rate by one order of magnitude relative to that achieved in our previous measurements[1].
[1] W. Rosenfeld, Phys. Rev. Lett. 119, 010402 (2017).