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shminux comments on An explanation of the 'Many Interacting Worlds' theory of quantum mechanics (by Sean Carroll and Chip Sebens) - Less Wrong Discussion
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Comments (7)
That's not how the double-slit experiment works. Both slits remain open at all times. The detector only detects the passage of the particle through one of the slits.
Right.
I'm not saying I'm an expert, or even that I'm remotely intriguied by Interacting Many Worlds.
My point is, as long as the photon(s) have been undetected, they can travel through both slits.
As soon as you detect the photon at one of the slits, it cannot, as it has been measured at one of the slits.