An anonymous reader writes: In a newly published paper, MIT researchers propose an experiment that may close the last major loophole of Bell’s inequality. The test is to see whether, as far-fetched as it sounds, a particle detector’s settings conspire with events in the shared past to determine which properties of a particle to measure — a scenario that implies that a physicist running the experiment does not have complete free will in choosing each detector’s setting. The test involves quasars, telescopes and lots of deep, deep space, and was published this week in the journal Physical Review Letters.
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