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    Explorable

    Tag the slits, then try to erase the tag

    Mark a double slit's paths with polarizers or quarter-wave plates, turn the eraser polarizer and watch which photons keep their stripes.

    Slit tags
    Eraser (polarizer before screen)
    +45°

    0° and ±90° read the path; ±45° erase it.

    3162
    DETECTED1593 of 3162
    PASSED (EXPECTED)50.0 %
    FRINGE VISIBILITY1.00
    PATH INFORMATION0.00

    The physics, the assumptions behind this tool and the sources are explained in The quantum eraser: single photons, a double slit, and what “erasing” really means.

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