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Landauer limit demonstrated

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Geplaatst op 08 maart 2012 - 15:23

Landauer Limit Demonstrated

Scientists show that a 50-year-old principle limiting future CMOS computing is real: Erasing information gives off heat

Physicists in Europe have experimentally demonstrated, for the first time, that a theoretical principle limiting modern-day computing is real.In 1961, Rolf Landauer posited that the act of erasing a bit of information gives off an amount of heat related to the temperature and Boltzmannís constantóa total of 3 x 10-21 joules at room temperature. Among other things, the theory has been used to address the famous problem of Maxwellís Demon, a thought experiment that suggested a minute monster could create energy for free by sorting particles by their speed, in apparent violation of the laws of thermodynamics. Prior to 1982, when IBMís Charles Bennett applied Landauerís theory to the problem, the thinking was that the demonís act of making measurements produced heat, eliminating the violation. But Bennett argued that heat was produced because the demon had to erase a bit of information in its memory in order to sort each particle.


ďThis is beautiful experimental work,Ē says IEEE Fellow Mark Lundstrom, a professor of electrical and computer engineering at Purdue University and an expert on the limits of nanodevices. ďItís remarkable that Landauerís gedanken [thought] experiment can now actually be done.Ē


Lees verder: http://spectrum.ieee...it-demonstrated

Bron: IEEE Spectrum

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