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The super bizarre quantum eraser experiment

What is Quantum eraser experiment ?

In quantum mechanics, the quantum eraser experiment is an interferometer experiment that demonstrates several fundamental aspects of quantum mechanics, including quantum entanglement and complementarity. The quantum eraser experiment is a variation of Thomas Young’s classic double-slit experiment. It establishes that when action is taken to determine which of 2 slits a photon has passed through, the photon cannot interfere with itself. When a stream of photons is marked in this way, then the interference fringes characteristic of the Young experiment will not be seen. The experiment also creates situations in which a photon that has been “marked” to reveal through which slit it has passed can later be “unmarked.” A photon that has been “marked” cannot interfere with itself and will not produce fringe patterns, but a photon that has been “marked” and then “unmarked” will interfere with itself and produce the fringes characteristic of Young’s experiment.


The quantum eraser experiment is one of the weirdest phenomena that has ever been observed.  It seems that quantum mechanics mixes past and future together.  Fermilab’s Dr. Don take you through this quantum conundrum.

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