It is unlikely that quantum computers that outperform classical systems at practical tasks can be built https://spectrum.ieee.org/computing/hardware/the-case-against-quantum-computing …
The problem is that this state collapses upon measurement into a classical one, so saying that it is simply a complex state does not do it justice.
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Oh wait? I don't think he's proposing how one /should/ say it, just noting that the suuuper common "it's both up *and* down!" is cargo cult knowledge.
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The question is whether the ground truth is indefinite, or if the uncertainty is related to uncertainty about your own state, I think. The math preserves the ambiguity, the verbal description does not. But it might mean that the math is incomplete!
End of conversation
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