Jena 2013 – scientific programme

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AGPhil: Arbeitsgruppe Philosophie der Physik

AGPhil 9: Foundations of Quantum Mechanics 2

AGPhil 9.1: Talk

Wednesday, February 27, 2013, 14:00–14:30, SR 113

Experiments thought to prove non * locality may be artifacts — •Karl Otto Greulich — Beutenbergstr, 11 D 07745 Jeba

Detecting non-locality via entanglement, reflected by the instantaneous transfer of quantum properties over a large distance, requires almost ideal experimental conditions * ideal sources for entangled photon pairs and ideal detectors. Deviations from this ideal situation may critically hamper interpretations of experiments on non-locality or entanglement. Of two major known loopholes, the detector loophole is not yet unequivocally closed. Now another loophole emerges: When in such experiments downconverting crystals with lasers as primary light sources are used, exceeding threshold values in the Bell inequalities, i.e. their violation, can be caused by so far not fully recognized problems in the generation and detection of photon pairs. Taken together, nonlocality is still not yet unequivocally proven. Thus, one of the most serious experimental challenges of causality is on brittle ground.

References: K.O. Greulich , Another loophole for the Bell inequalities Proc. of SPIE Vol 7421 * 08, (2009) ; K.O. Greulich Proc. of SPIE Vol 8121-15, (2011); for downloads see, http://www.fli-leibniz.de/www_kog/ then klick *Physics*