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Hannover 2013 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 35: Poster I

Q 35.22: Poster

Tuesday, March 19, 2013, 16:00–18:30, Empore Lichthof

Towards a Loophole Free Bell Test with a Pair of Remotely Entangeld 87Rb-Atoms — •Kai Redeker1, Daniel Burchardt1, Norbert Ortegel1, Julian Hofmann1, Michael Krug1, Markus Weber1, Wenjamin Rosenfeld2, and Harald Weinfurter1,21Fakultät für Physik, Ludwig-Maximilians-Universität München, D-80799 München, Germany — 2Max-Planck Institut für Quantenoptik, D-85748 Garching, Germany

Bell's inequality allows to test the validity of local hidden variables theories. To perform a conclusive Bell test, one has to fulfill two major requirements: The state measurements of the entangled particles need to be highly efficient and space like separated.

We present progress towards an experiment which can fulfill both requirements. We use entanglement between single trapped atoms and single photons to create heralded entanglement between separated atoms [1]. The measurement including choosing a random setting and efficiently reading out the atomic state, will take less then one microsecond. This is achieved by state dependent ionization and subsequent detection of the ionization fragments [2]. We plan extending the distance between the atoms from now 20m to 400m to enable the space like separation of the measurements on the atoms. Together, this will enable to finally close the locality and the efficiency loophole in one experiment.

[1]J.Hofmann et al. Science 337, 72 (2012)

[2]F.Henkel et al. Phys. Rev. Lett 105 253001 (2010)

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