The oddness of quantum mechanics came to the fore in an epic face-off between Einstein and Bohr in the 1930s. On one side, Einstein said that quantum mechanics discards accepted notions of localism (a measurement couldn’t be influenced by a remote experiment) and realism (outcomes of measurements only depend on the thing being measured, not on the measurer). On the other side, Bohr said that’s right, and you’d better get used to it. Writing in Physical Review Letters, Bradley Christensen at the University of Illinois at Urbana-Champaign and colleagues report an experiment that solves one of the major experimental limitations that have denied a definitive win for quantum mechanics.
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