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I see a lot of the same hand-waving arguments coming from QC researchers as I saw at QC conferences in the early 2000s. As systems grow, things don’t always scale the same. I’m no longer involved in QC so I won’t pretend to be an expert but I believe this isn’t just an engineering challenge. There may very well be fundamental physics challenges that limit the viability of large scale QC systems. I wouldn’t bet against human ingenuity but this complexity doesn’t compare to LLMs where the discovery was simply more compute.