On 3/13/2012 9:48 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, and
we can transform energy into information, and perhaps a quantum
nuclear computing machine can appear on the horizon.
Note that the self-duplication, à-la W/M, produces one first person
bit of information ("W or M"), which suggests that consciousness might
be always associated with an energy => information flow. Energy, mass
and information would be, and probably are, different aspect of the
self-multiplication in arithmetic, as it should be by the UD A.
The problem is that such a matter, even a vacuum, should contain an
infinite amount of energy, but similar problems occur also with
quantum field theory, and thus led to renormalization theories, and we
can expect important renormalization in the comp physics too.
Last, but not least, this confirms also Bennett analysis of the
Maxwell Daemon. I think.
We are not just machine, we are steam engine.
All we need is a bit of heat, to *forget* taxes and death ...
Thanks for the link, Russell.
Bruno
http://iridia.ulb.ac.be/~marchal/
Dear Bruno,
Forgive me but there is one resource without which computation
cannot occur: Memory. Without the genus invariant manifolds upon which
the Machines can write their equations, the machines cannot run, just as
without our chalkboards and computer screens we cannot do our calculations.
Onward!
Stephen
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