Yet another tiresome attempt at banging the round peg of QM into a square, classical hole
Im too lazy to pursue the classical handwaving into adequate equations, but I notice the FAIL at the last sentence:
And if reality is analogue all the way down, then quantum computers are just analogue computers, so their failure to deliver magical results is unsurprising. In fact, we'd rather see it as evidence that the emergent quantum mechanics research community may be on the right track.
Their "failure to deliver magical results is unsurprising", really?
First of all these results are not magical and of course they are analog. The "failure to deliver magical results" has to do with adequate production processes. No-one has yet said "that's odd" because the machine magically fails (which would be interesting). It isn't even big enough yet to exhibit such an interesting effect.
Not so long ago it was not at all clear that large digital machines could be constructed because errors due to stray voltages and flaky vaccum tubes may well propagate and swamp the delicate computation of the state machine. Amazingly, it was all solved and no-one except overclockers give this problem much thought today.
Also, Scott Aaronson in Collaborative Refutation.
"Third thought: it’s worth noting that, if (for example) you found Michel Dyakonov’s arguments against QC (discussed on this blog a month ago) persuasive, then you shouldn’t find Anderson’s and Brady’s persuasive, and vice versa. Dyakonov agrees that scalable QC will never work, but he ridicules the idea that we’d need to modify quantum mechanics itself to explain why. Anderson and Brady, by contrast, are so eager to modify QM that they don’t mind contradicting a mountain of existing experiments. Indeed, the question occurs to me of whether there’s any pair of quantum computing skeptics whose arguments for why QC can’t work are compatible with one another’s. (Maybe Alicki and Dyakonov?)
But enough of this. The truth is that, at this point in my life, I find it infinitely more interesting to watch my two-week-old daughter Lily, as she discovers the wonderful world of shapes, colors, sounds, and smells, than to watch Anderson and Brady, as they fail to discover the wonderful world of many-particle quantum mechanics. So I’m issuing an appeal to the quantum computing and information community. Please, in the comments section of this post, explain what you thought of the Anderson-Brady paper. Don’t leave me alone to respond to this stuff; I don’t have the time or the energy. If you get quantum probability, then stand up and be measured!"
Beer to that, Scott.