On 12/3/2013 6:17 PM, freqflyer07281972 wrote:
Hey everyone,
Here is a question for Bruno (and anyone else who wants to chime in) --
I came across this post <http://www.preposterousuniverse.com/blog/2013/11/28/thanksgiving-8/> over at Sean Carroll's Preposterous Universe blog, wherein he seems to be claiming that the relationship between information, entropy, and physical processes is pretty well in the bag, i.e. it is well understood by physicists and it seems that the concept of information can be cashed out entirely in terms of physical processes.


But if the processes are reversible (and they can be) then there is no entropy increase and no heat. Feynman already outlined how this would have to be done in quantum computers.

I think the problems are far from solved. Black holes, in the semi-classical approximation seem to destroy information and there are various proposals for preserving the unitary evolution of quantum mechanics, but none that are completely satisfactory.

Brent

What does this do to your thought experiment and your Platonic orientation towards questions of information theory? How would you go about explaining the deep relationship between entropy, information, and the physical evolution of the universe?
Cheers,
Dan
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