Yhden bitin unohtamisen tuottama lämpö mitattu

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Viestejä2516
Liittynyt13.3.2008

http://www.nature.com/news/the-unavoida ... ed-1.10186

IBM:n labrassa mitattiin yhden bitin unohtamisesta aiheutuva lämpeneminen. Tuloksen perusteella Maxwellin demonia ei voi olla olemassa:

But Jarzynski points out that the work also demonstrated that selectivity requires the information about fluctuations to be stored.

He says that Lutz’s experiment now completes the argument against using Maxwell’s demon to violate the second law of thermodynamics, because it shows that “the eventual erasure of this stored information carries a thermodynamic penalty”.




Bérut, A. et al. Nature 483, 187–189 (2012).

Abstrakti:
"Experimental verification of Landauer’s principle linking information and thermodynamics"
http://www.nature.com/nature/journal/v4 ... 10872.html

Keskustelua Slashdotissa:
http://science.slashdot.org/story/12/03 ... single-bit

Kim Fallström kfa+news@iki.fi

Kommentit (1)

Vierailija
kfa
http://www.nature.com/news/the-unavoidable-cost-of-computation-revealed-...

IBM:n labrassa mitattiin yhden bitin unohtamisesta aiheutuva lämpeneminen. Tuloksen perusteella Maxwellin demonia ei voi olla olemassa:

But Jarzynski points out that the work also demonstrated that selectivity requires the information about fluctuations to be stored.

He says that Lutz’s experiment now completes the argument against using Maxwell’s demon to violate the second law of thermodynamics, because it shows that “the eventual erasure of this stored information carries a thermodynamic penalty”.




Bérut, A. et al. Nature 483, 187–189 (2012).

Abstrakti:
"Experimental verification of Landauer’s principle linking information and thermodynamics"
http://www.nature.com/nature/journal/v4 ... 10872.html

Keskustelua Slashdotissa:
http://science.slashdot.org/story/12/03 ... single-bit




Ei Maxwellin demonia ole vielä täysin kuopattu:

http://spectrum.ieee.org/computing/hard ... monstrated

"But irreversible logic isn’t the only way to compute. An experimental form of computing called reversible logic doesn’t necessitate destroying information. So, in principle, it could dodge Landauer’s limit.

According to Gregory L. Snider, professor of electrical engineering at the University of Notre Dame, in Indiana, reversible logic does just that. In results to be published in the Japanese Journal of Applied Physics, he and his colleagues demonstrate an electronic reversible logic system that gives off less heat than Landauer’s limit. “There is no limit if you’re doing it reversibly,” says Snider."

Eli mikäli Maxwellin demoni käyttää "reversible logic" systeemiä, voidaan Landauer raja ohittaa. Odotettavissa onkin kiivasta väittelyä fyysikkojen parissa tästä.

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