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Science  18 Dec 2015:
Vol. 350, Issue 6267, pp. 1458-1463
DOI: 10.1126/science.350.6267.1458

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  • RE: Quantum weirdness confirmed

    The article "Quantum weirdness confirmed" contains an error.

    The article says, "In 1964, the U.K. theorist John Bell realized that subtle statistical measurements could reveal whether hidden variables were at work." It is not true that the hypothesis for Bell's Inequality involves "hidden variables". The only hypothesis is locality. See the book "Speakable and Unspeakable in Quantum Mechanics" by John Bell or "Bell's Theorem" in Scholarpedia (http://www.scholarpedia.org/article/Bell's_theorem).

    So, the experiment discussed in the article provides more evidence that locality is false. A better title for the article would be "Nonlocality confirmed".

    As for "hidden variables", Bohmian Mechanics (John Bell's preferred theory) has "hidden variables", violates the conclusion of Bell's Theorem, and agrees with experiment. The "hidden variables" in Bohmian Mechanics are the positions of the particles.

    The following article reports experimental evidence that photons follow Bohmian trajectories:

    Observing the Average Trajectories of Single Photons in a Two-Slit Interferometer
    Sacha Kocsis et al.
    Science 332, 1170 (2011);
    DOI: 10.1126/science.1202218

    Competing Interests: None declared.