On 2/16/2012 7:58 PM, meekerdb wrote:
But QM is consistent with some things (almost all big things) being almost exactly classical. There is no reason to think our brains depend on non-classical processes to perform computations (metabolism - yes, computation - no). Certainly it would be a severe evolutionary disadvantage if there were more than a just a little randomness in the function of a brain.

Hi Brent,

"Almost is" does not equal "is". Sure, if we are considering objects that have huge masses and thus have aCompton wavelength <http://en.wikipedia.org/wiki/Compton_wavelength> that is almost beyond the range of our ability to measure it, when we can get away with thinking of them as "almost exactly classical"and thus FAPP is ok to say that they are "classical". But we are not talking about Jupiter (the planet), we are talking about the human brain and digital substitution of its computational function. The human brain is not an homogenous mass (pace Tegmark), it has lots and lots of very fine structure, structure that is well within the range of having a large enough Compton wavelength to make a difference what makes a difference about quantum stuff.

Classical teleportation is, like classical substitution, simply a pipe dream.

Makes no sense!? Being classical is exactly what allows teleportation and functional substitution.

Does computational universality only works for objects that have a Compton wavelength that is tiny? That is what you are in effect asking us to believe.



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