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A home experiment is described in which the experimenter can perform quantum erasure, an effect that involves the ability to take actions that change the basic interpretation of what occurred in past events. The experiment involves the use of a very dark room, polarizing film, a laser, a thin straight piece of wire, tinfoil and a pin, strands to hold laser and polarizers in place, and a screen for showing final patterns. With quantum mechanics, the behavior exhibited by something can depend on what the person tries to find out about it. Therefore, an electron can act like a particle or wave, based on what the experimental setup is. Topics covered are what a quantum eraser erases, what is needed for the experiment, seeing interference, labeling the path, selecting left-passing photons, selecting right-passing photons, erasing path information, anti-eraser, both erasers at once, the conclusion, what polarizers do to photons, how a quantum eraser works, and finding more information at sciam.com/ontheweb. The last two steps reveal that which way? information can be erased in more than one way and will produce either the original interference pattern or its inverse.
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