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Experimental test of nonlocal causalityOur results demonstrate that a causal influence from one measurement outcome to the other, which may be subluminal, superluminal, or even instantaneous, cannot explain the observed correlations
http://advances.sciencemag.org/content/2/8/e1600162
However, if you're in control of the switch yourself, you can tell the difference. In their experiment, Ringbauer and colleagues fixed the outcome of measurement on one photon by inserting optical devices that affected its polarization before the measurement was made. They then looked for a concurrent change in the statistics of the other. Because they saw none, they concluded that there could be no nonlocal causality at play in which measurement outcomes on one photon could cause changes in those on the other.
The team then did a more complicated experiment involving three possible measurement settings as opposed to just two for the CHSH experiment. This allowed them to verify that their conclusions are independent of the specific apparatus used to do the tests. In other words, the results do not depend on any particular type of intervention.
Quantum mechanics trumps nonlocal causality
http://physicsworld.com/cws/article/news/2016/aug/18/quantum-mechanics-trumps-nonlocal-causality
Having just read the full paper it seems to that it doesn't rule out contextual nonlocal causality or am I mistaken?
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