Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 2: Quantum Communication I

Q 2.1: Gruppenbericht

Montag, 6. März 2017, 14:30–15:00, P 3

Event-ready Bell test using entangled atoms simultaneously closing detection and locality loopholes — •Wenjamin Rosenfeld1,2, Daniel Burchardt1, Kai Redeker1, Robert Garthoff1, Norbert Ortegel1, Markus Rau1, and Harald Weinfurter1,21Ludwig-Maximilians-Universität, München — 2Max-Planck-Institut für Quantenoptik, Garching

Bell’s inequality allows testing experimentally whether nature can be described in a local-realistic way. In order for such a test to be meaningful, at least two major requirements need to be fulfilled: the detection efficiency of the particles has to be high enough and the measurements on the two sides have to be space-like separated in order to avoid loopholes. It is due to these demanding requirements, that it took more than 40 years of experimental development until such tests became possible.

Here we present our results for a Bell test using heralded entanglement of two neutral Rb-atoms over a distance of 400 m [1]. The obtained violation of 2.22 ± 0.033 >2 provides a strong evidence against local realism. Beyond their fundamental importance such tests also form the basis for novel communication methods like device-independent quantum key distribution. Moreover, entanglement of remote quantum memories is a central building block of future quantum repeaters.

[1] arXiv:1611.04604 [quant-ph]

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