Also: Bell inequality, Aspect experiment, loophole-free
Experiments showing that entangled particles are correlated in ways no local-realist theory can explain.
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Aspect, Dalibard and Roger measured photon polarization correlations with fast-switching analyzers; results agreed with quantum mechanics and violated Bell's inequalities.
As reported in: Aspect, Dalibard, Roger (1982). Experimental Test of Bell's Inequalities Using Time- Varying Analyzers. Physical Review Letters. doi:10.1103/PhysRevLett.49.1804
Hensen and colleagues violated a Bell inequality with electron spins 1.3 km apart, without the extra assumptions earlier tests needed.
As reported in: Hensen, Bernien, Dréau et al. (2015). Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres. Nature. doi:10.1038/nature15759