Hannover 2010 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 55: Poster II
Q 55.51: Poster
Donnerstag, 11. März 2010, 16:00–19:00, Lichthof
Towards a Loophole-free Test of Bell’s Inequality with Entangled Pairs of Neutral Atoms — •Christoph Kurz1, Julian Hofmann1, Michael Krug1, Florian Henkel1, Wenjamin Rosenfeld1, Markus Weber1, and Harald Weinfurter1,2 — 1Fakultät für Physik, Ludwig-Maximilians-Universität München, D-80799 München, Germany — 2Max-Planck Institut für Quantenoptik, D-85748 Garching
Experimental tests of Bell’s inequality allow to distinguish quantum mechanics from local hidden variable theories. Such tests are performed by measuring correlations of two entangled particles (e.g. spins of atoms). In order to constitute conclusive evidence, two conditions have to be satisfied. First, strict separation of the measurement events in the sense of special relativity is required (“locality loophole”). Second, almost all entangled pairs (for particles in a maximally entangled state the required one-side detector efficiency is 82.8%) have to be detected, which is hard to achieve experimentally (“detection loophole”). By using the recently demonstrated entanglement between single trapped atoms and single photons [1] it becomes possible to entangle two atoms at a large distance via entanglement swapping. Combining the high detection efficiency achieved with atoms with the space-like separation of the atomic state detection events, both loopholes can be closed within the same experiment [2]. In this contribution we present recent experimental progress which shows that such an experiment is feasible.
[1] J. Volz et al., Phys. Rev. Lett. 96, 030404 (2006). [2] W. Rosenfeld et al., Adv. Sci. Lett. 2, 469 (2009).