On 13.03.2012 18:20 meekerdb said the following:
On 3/13/2012 6:48 AM, Bruno Marchal wrote:
On 13 Mar 2012, at 01:43, Russell Standish wrote:
http://www.nature.com/news/the-unavoidable-cost-of-computation-revealed-1.10186
This about experimentally testing Landauer's principle that
computation has thermodynamic constraints.
I was worrying a bit with that title, thinking Landauer's principle
was refuted, but on the contrary, it is confirmed.
The title is misleading, because it looks like computation would need
energy, but the energy is needed only for erasing information, and
since a paper by Hao Wang (universal, and thus all) computations can
be done without ever erasing information.
This confirms also that we can transform information into energy,
That's not quite right. We can use information to make energy available
for work, i.e. reduce entropy. The energy is already there, it's just
not accessible for useful work.
Brent
Could you please give one example from physics (yet please not a thought
experiment) where information allows us to reduce entropy?
As fas a I remember, you have told previously that information in
physics is the entropy, so your statement now looks a bit strange.
Evgenii
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