Silly Druid
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I kinda found this more useful than the other videos. I don't know if the creepy cat made the difference, or if it was just a very slow an easy to follow demonstration.
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Two detectors, each of them in front of just one of the slits. The detector, a crystal, spits out a photon if a particle passes through it.
The particle continues through the known slit, while the photon goes through a series of mirrors, randomly passing through or getting reflected, and thus,
erasing the knowledge of which slit the particle went through.
As the particle hits the resulting screen, it is either a wave or a cancelled wave depending on where the photon ended up in the detector, since one detector could have gotten the result of the other detector, it is impossible for the particle to know which slit it went through.
The result is only an interference pattern if the knowledge wasn't looked at, AND the detector got the..... Oh, look at the cute cat! -
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