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mwengler comments on How Many Worlds? - Less Wrong
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The wikipedia article states
If a quantum computer could correctly be characterized as a computer which utilized the transistors in other branches of the multiverse to speed up calculations in this one, then it would merely require the operation of any quantum computer at all to provide strong evidence for the multiverse. However, the article states that a test for MWI requires a particular special operation of a particular special quantum computer, that the multiverse is not a conclusion we reach merely by seeing a quantum computer work.
Sorry I didn't make that connection clearer before.
I'm pretty confident that that paper is in error. Or rather, it assumes that the Copenhagen Interpretation is implemented so that it deviates from pure Quantum Mechanics in a particular, testable, way (or category of ways) - and that renders his version of CI distinguishable from MWI, and less useful for quantum computing. When I get academic library access again, I'll take a closer look at it.