Bell correlations in a Bose-Einstein condensate

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The strongest form of correlations between particles are those that violate a Bell inequality. We have detected such Bell correlations between 480 atoms in a Bose-Einstein condensate, using a witness inequality that we derived in collaboration with the theory groups of N. Sangouard and V. Scarani. The results were reported inĀ ScienceĀ 352, 441-444 (2016).