Séminaire du LPTMS: Takahiro Sagawa

Information Thermodynamics in Small Systems

Takahiro Sagawa, Yukawa Institute for Theoretical Physics, Kyoto University

Ever since the proposal of « Maxwell’s demon » in the nineteenth century, the relationship between thermodynamics and information has attracted numerous attentions concerning the foundation of the second law of thermodynamics [1,2]. The demon seems to be able to violate the second law by using the information about the microscopic degrees of freedom of thermodynamic systems. Due to the recent developments of the experimental technologies of manipulating small thermodynamic systems, the demon has become a topic of active researches both in terms of theory and experiment of nonequilibrium statistical physics. In this seminar, I’d like to talk about our theoretical and experimental results on the foundation of the relationship between thermodynamics and information [3-6]. Theoretically, I will focus on the generalizations of the second law of thermodynamics to information processing processes such as measurement and feedback, in which information contents and thermodynamic variables are treated on an equal footing. I’d also like to talk about our experimental result, which has experimentally realized a Maxwell’s demon that uses the obtained information as a resource of the free energy and the work [7].

References:

[1] « Maxwell’s demon 2: Entropy, Classical and Quantum Information, Computing, » H. S. Leff and A. F. Rex (eds.), (Princeton University Press, New Jersey, 2003).
[2] T. Sagawa and M. Ueda, arXiv:1111.5769, to appear in R. Klages, W. Just, C. Jarzynski (Eds.), « Nonequilibrium Statistical Physics of Small Systems: Fluctuation Relations and Beyond » (Wiley-VCH, Weinheim, 2012).
[3] T. Sagawa and M. Ueda, Phys. Rev. Lett. 100, 080403 (2008).
[4] T. Sagawa and M. Ueda, Phys. Rev. Lett. 102, 250602 (2009).
[5] T. Sagawa and M. Ueda, Phys. Rev. Lett. 104, 198904 (2010).
[6] T. Sagawa and M. Ueda, arXiv:1206.2479, to appear in PRL.
[7] S. Toyabe, T. Sagawa, M. Ueda, E. Muneyuki, and M. Sano, Nature Physics 6, 988-992 (2010).


Date/Time : 26/10/2012 - 11:00 - 12:00

Location : LPTMS, salle 201, 2ème étage, Bât 100, Campus d'Orsay

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