Sydell Gold was my mom (a mathematician by training). Thankfully, sometimes there is someone there to say something.

]]>“A quantum computer, however, simultaneously analyzes all possible paths at the same time, with lightning speed” – it’s not clear what does he means by “lightning speed”. If he wanna say that QC calculates *instantly*, then this is not so – there’s the Margolus-Levitin theorem, which limits the time of *any* calculations to at least t = h/4E, where E is the average energy (assuming the energy of the ground state is zero), and t is the transition time of the system from one orthogonal state to another. Instantaneous computing requires infinite energy/breaking Planck barriers and doesn’t exist.

By the way, in my opinion, in principle, the separation of computing into “classical” and “quantum” makes little sense. Classical computing is actually quantum one, but using only pure states. As we remember, only pure states can be copied, but not mixed states (therefore, we can copy as much as we like in classical computing, but in principle it is impossible to copy in quantum ones).

]]>I don’t know so much about the public’s perception of Michio Kaku’s competence at topics outside his primary specialty/specialties. Last year I began looking into Quantum Field Theory texts for some introduction into the field, and I found his book helpful.

I stumbled across this blog for the first time a while back, and now it’s exciting to finally understand the “Quantum computers won’t solve hard problems instantly by just trying all solutions in parallel” headline haha.

I’ve always wondered “Why not? Isn’t that why quantum computers are so popular in the first place, and why they hold such exciting prospects for the future?”

From this post I understand that just one random outcome of the QC’s “parallel” computation can be measured. Which makes me then wonder what all the excitement about QCs is about in the first place, since all of that parallel processing power is mostly left unharnessed. Although of course I imagine there’ll be techniques to possibly leverage knowledge of the concerned probability distribution- to increase the chances that the observed outcome is one which is more important/valuable than others in some regard, etc.

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It would be great if you can do an episode with him on quantum computing or complexity theory or even busy beavers.

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