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 …
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Replying to @Plinz
"Somebody might say that this [45°] vector simultaneously points in both the x- and y-directions. [T]rue... but it’s not really a useful description. Describing a qubit as being simultaneously in both ↑ and ↓ states is, in my view, similarly unhelpful." Brilliantly said!
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Replying to @erikdkennedy
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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Replying to @Plinz
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!
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