Experimental test of quantum contextuality

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Experimental test of quantum contextuality

Hidden variable modelsEinstein, Podolsky and Rosen’s questionIs quantum mechanics complete? Or is there some hidden variable (HV)theory behind it?A. Einstein, B. Podolsky, N. Rosen, Phys. Rev. 47, 777 (1935).Bell’s answerIf a hidden variable model is local, it can be ruled out experimentally.J.S. Bell, Physics 1, 195 (1965); Aspect et al., Phys. Rev. Lett. 47, 460 (1981)Also other models for distant correlations can be ruled out.A. Leggett, Found. Phys. (2003); S. Groeblacher et al, Nature (2007); C. Branciard et al, Nat. Phys. (2008)But what if one has only one quantum system?

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