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arXiv:cond-mat/9905232 · Czechoslovak Journal of Physics

A thought construction of working perpetuum mobile of the second kind

Vladislav Čápek, Jiří Bok

Published Dec 1, 1999• 24 citations
arXivHTMLPDF
DOI
10.1023/a:1022883701920

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It is noted that old belief in impossibility of any perpetuum mobile is the basis of the great confidence in the second law of thermodynamics. The Carnot’s principle, «called with the time of Rudolf Clausius as the second law of thermodynamics», was based on this belief and this belief saved the second law in the beginning of 20 century when absolute randomness of any Brownian motion, perpetual motion experimentally observed, was postulated. It is shown that this postulate is not correct according to quantum mechanics. Moreover experimental evidence of its violation is known. Violation of this postulate means violation of the second law and a possibility of useful perpetuum mobile.

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It is argued using a Gedankenexperiment that a scalable quantum memory could be used as a perpetuum mobile of the second kind and hence cannot be realized in nature. The reasoning is based on the assumption that the Landauer's principle for measurements is a consequence of the second law of thermodynamics and not an independent postulate. This implies a modification of the Landauer's principle when applied for discrimination of equilibrium (metastable) states. While identification of the metastable state can be done at infinitesimally low cost, any change of such state involves dissipation of energy proportional to its stability factor.
It is noted that old belief in impossibility of any perpetuum mobile is the basis of the great confidence in the second law of thermodynamics. The Carnot’s principle, «called with the time of Rudolf Clausius as the second law of thermodynamics», was based on this belief and this belief saved the second law in the beginning of 20 century when absolute randomness of any Brownian motion, perpetual motion experimentally observed, was postulated. It is shown that this postulate is not correct according to quantum mechanics. Moreover experimental evidence of its violation is known. Violation of this postulate means violation of the second law and a possibility of useful perpetuum mobile.