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There’s a quick question here that has at least one upvote at the time of writing, and has an on-point answer, but I struggle to see the relevance of the question to quantum computing.

The question is uniquely about Sakurai’s definition of the gyromagnetic ratio and where the speed of light $c$ comes in. I’m trying to be favorable and not dismiss it yet, as there were some other well-received questions here and on MathOverflow about the relevance (or rather, the lack of relevance of) of $\hbar$ to quantum computing, so questions of units and fundamental constants aren’t completely off-topic.

But, Sakurai is a standard textbook for quantum mechanics and not so much quantum, or really anything, computing.

Is this an edge case that we should live with, given that it was quickly and properly answered?

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  • $\begingroup$ What do you think of this: quantumcomputing.meta.stackexchange.com/q/281/2293 ? $\endgroup$ Jun 14, 2023 at 3:06
  • $\begingroup$ Thanks! Although I am one of the eight +1s apparently for that question, now I’m not so sure about it tbqh. I wouldn’t want this site to turn into the theoretical computing site, as there’s already a stack for that (although it gets much less volume than we do). I don’t think a question uniquely about Arora and Barack, or Knuth, are relevant for this site. $\endgroup$ Jun 14, 2023 at 3:34
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    $\begingroup$ I think it should really depend on whether the question is framed from an informational perspective or not. If it asks about the underlying physics, as Sakurai-like questions (and generally questions arising from standard textbooks introducing quantum mechanics) will tend to be, it's much better asked on physics.SE, which will have plenty of related questions and a more receptive public already. If it asks about more "informational aspects" (eg bra-ket formalism, more general questions about entanglement or coherent or superposition, etc) then it's fine here $\endgroup$
    – glS Mod
    Jun 14, 2023 at 7:28
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    $\begingroup$ also, regarding the related post: I agree that questions about "quantum foundations" are fine, but "quantum foundations" is a very specific line of research within quantum information, and I certainly wouldn't label questions about basic quantum mechanics as questions about "quantum foundations". $\endgroup$
    – glS Mod
    Jun 14, 2023 at 7:43

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