Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 3: Quantum Information: Concepts and Methods I
Q 3.1: Talk
Monday, February 29, 2016, 11:00–11:15, e214
Testing Bell’s inequality with atoms entangled over a distance of 400m — •Daniel Burchardt1, Robert Garthoff1, Norbert Ortegel1, Kai Redeker1, Markus Rau1, Wenjamin Rosenfeld1,2, and Harald Weinfurter1,2 — 1Ludwig-Maximilians-Universität, Munich, Germany — 2Max-Planck-Institut für Quantenoptik, Garching, Germany
Bell’s inequality allows to exclude local hidden variable theories and forms the basis for certified generation of random numbers and device-independent quantum key distribution. Experimentally it requires highly efficient and spacelike separated measurements on entangled particles.
We present our approach using heralded entanglement of two neutral 87Rb-atoms [1]. Based on state selective ionization and detection of the ionization fragments, we implemented a sub-µ s atomic state readout with very high detection efficiency [2]. To close the locality loophole the two setups were separated by a distance of 400m. We will discuss the critical experimental details, namely the control of the coherence properties of the atoms and the synchronisation of both setups and present first results of a test of Bell’s inequality.
[1] J. Hofmann et al., Science 337, 72 (2012).
[2] F. Henkel et al., Phys. Rev. Lett. 105, 253001 (2010).