William N. Plick, Robert Fickler, Radek Lapkiewicz, Sven Ramelow
In the study of systems that can not be explained classically, the Wigner inequality, has received only a small amount of attention. In this paper we extend the Wigner inequality - originally derived in 1969 - and show how it may be used to contradict local realism with only coincidence detections in the absence of two-outcome measurements - that is, any system where only one possible result of a pair of potential outcomes can be registered. This encapsulates a much broader class of measurement schemes than could previously violate a local-realistic inequality. We then apply this inequality to a recently constructed setup with access to entangled pairs of photons with very high angular momenta, in which no previously derived local-realistic inequality could successfully be used without making very broad assumptions. This experiment constitutes the first violation of local realism with such high quanta. We thus demonstrate the versatility of this inequality under very lossy conditions.
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http://arxiv.org/abs/1304.2197
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