Experimental test of quantum contextuality

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The Kochen-Specker theoremQuantum mechanics cannot be explainedby non-contextual hidden variable models.E. Specker, Dialectica 14, 239 (1960), J.S. Bell, RMP 38 (1966), S. Kochen, E. Specker, J. Math. Mech. 17 (1967).What does non-contextuality mean?
CompatibilityCompatibility of measurementsDefinition. Two measurements A and B are called compatible (A ∼ B) ifthey can be measured simultaneously or in any order without disturbance.If a sequence like A 1 B 2 A 3 B 4 A 5 A 6 B 7 ... is measured on a single state,then the values of A and B remain the same.Compatibility is experimentally testable.In QM: Commuting observables are compatible.This is a pairwise relation, but one can also talk about compatibilityof three or more observables.
Page 1 and 2: Experimental test of quantum contex
Page 3: Hidden variable modelsEinstein, Pod
Page 7 and 8: The Mermin-Peres squareConsider a f
Page 9 and 10: The experimental implementation
Page 11 and 12: Results for the singlet statea b c
Page 13 and 14: State independenceViolations rangin
Page 15 and 16: What have we shown so far?Conclusio
Page 18 and 19: Generalized KS inequalityUsing this

Experimental test of quantum contextuality

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