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    Turn the dials: quantum pairs versus hidden instructions

    Rotate two polarizing filters and compare how often entangled photons agree with the best that pre-set instructions can do.

    EARTH · 0°MARS · 22.5°
    0°
    22.5°

    Only the difference between the two angles matters. Try a difference of 22.5° or 67.5°.

    ANGLE BETWEEN FILTERS22.5°
    QUANTUM · SAME RESULT85.4%
    BELL’S INSTRUCTION SCHEME · SAME RESULT75.0%
    GAP (QUANTUM − INSTRUCTIONS)+10.4 points

    Simulated pairs show the random scatter around each prediction.

    0%50%100%SAME RESULT0°22.5°45°67.5°90°ANGLE BETWEEN FILTERSQUANTUMINSTRUCTIONS

    The physics, the assumptions behind this tool and the sources are explained in Quantum entanglement: what it is (and isn’t).

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