Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 42: Poster: Quantum Optics and Photonics III
Q 42.31: Poster
Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof
Entangling two single trapped atoms over a distance of 400 m — •Robert Garthoff1, Daniel Burchardt1, Norbert Ortegel1, Kai Redeker1, Wenjamin Rosenfeld1, and Harald Weinfurter1,2 — 1Ludwig-Maximilians-Universität, München — 2Max-Planck-Institut für Quantenoptik, Garching
Long distance between entangled quantum systems is essential for quantum repeaters as well as for conclusive tests of Bell’s inequality, which itself is a central part in novel applications as device-independent quantum key distribution and certified generation of quantum random numbers.
We present an experimental realization employing heralded entanglement between two single Rb-87 atoms over a distance of 400 meter. To achieve a high degree of entanglement precise control of external parameters is required. In addition to the long distance requiring long coherence times, we implemented an fast and efficient atomic state readout with an overall duration of the state measurement below 1µs. In order to obtain a high number of events a longtime stability of the experimental setup presents an additional challenge. Together these ingredients form the basis for robust generation of entanglement and space-like separated measurements on the widely separated atoms as necessary for a conclusive test of Bell’s inequality. Moreover this system represents a basic quantum repeater link and may become a testing platform for device-independent quantum key distribution.