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linkhyrule5 comments on Open thread, 16-22 June 2014 - Less Wrong Discussion
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Except - and apologies if I'm wrong, since I don't completely understand the article - it seems like they first proved that this was equivalent (under current understanding of QM) to a system that includes a CTC.
So it looks like it's proving "If quantum mechanics works, this describes a CTC."
They ignore relativity completely and simulate qubit interaction on a background spacetime with CTCs. Interesting, but has nothing to do with testing the limits of QM.
Ah, I see. Thanks.