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That's precisely Many Worlds! The process you describe is a pretty close match for what's called decoherence. Perhaps you'll have more luck with those search terms, there are quite a few really good resources out there. Just be careful to steer clear of the partisans. However much I disagree with them, the shut-up-and-calculate people give the best overall picture, even when describing a particular interpretation.

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Is it? For one reason or another I thought there was a distinction, although reading back what I wrote a second time I can't figure out what it would be.

It's interesting to consider the implications of this line of thinking though; it seems like it would imply that causally-disconnected regions of spacetime (i.e. things outside of our light cone) are forever in a superposition of all possible quantum states, from our perspective, among other things.

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