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Even just the quantum algorithms are suspicious when you investigate them further. For example, some require "quantum oracles" for computation, while in some cases the answer to the problem is already inside the definition of such oracle. It sometimes seems as if you're giving the answer to the computation as it's argument. The Shor's algorithm is so fucking complicated I wouldn't be surprised if there's some trick hidden there. For some reason, even when Google made their new and shiny Sycamore quantum processor, they didn't implement any known algorithm for some interesting problem, but just used random quantum circuits as the argument for it's "supremacy" which was then heavily contested by IBM stating, that conventional computers could do it too, not in years as Google claimed, but in days. Building them is one thing, but even from algorithmic perspective I think there are problems.
