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this post was submitted on 09 Dec 2024
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It reads to me like either they got lucky or encountered a measurement error somewhere, but the peer review notes from Nature don't show any call outs of obvious BS, though I don't have any real academic science experience, much less in the specific field of quantum computing.
Then again, this may not be too far beyond the predicted boundaries of what quantum computers are capable of and while the assumption that computation is happening in alternate dimensions seems like it would require quantum physicists to agree on a lot more about interpretation than they currently do the actual performance is probably triggering some false positives in my BS detector.
The peer reviewers didn't say anything about it because they never saw it: It's an unilluminating comparison thrown into the press release but not included in the actual paper.
Maybe I'm being overzealous (I can do that sometimes).
But I don't understand why this particular experiment suggests the multiverse. The logic appears to be something like:
But I don't understand this argument at all. The universe is quantum, not classical. So why do other worlds need to help with the compute? Why does this experiment suggest it in particular? Why does it make sense for computational costs to be amortized across different worlds if those worlds will then have to go on to do other different quantum calculations than ours? It feels like there's no "savings" anyway. Would a smaller quantum problem feasible to solve classically not imply a multiverse? If so, what exactly is the threshold?
I mean, unrestricted skepticism is the appropriate response to any press release, especially coming out of silicon valley megacorps these days. But I agree that this doesn't seem like the kind of performance they're talking about wouldn't somehow require extra-dimensional communication and computation, whatever that would even mean.
Indeed, I've been involved in crafting a silicon valley megacorp press release before. I've seen how the sausage is made! (Mine was more or less factual or I wouldn't have put my name on it, but dear heavens a lot of wordsmithing goes into any official communication at megacorps)