29 Sep-1 Oct 2014 Grenoble (France)
Tuesday 30
Session 3
Sebastien Huard
› 14:00 - 15:15 (1h15)
› Meeting room D420
Information and thermodynamics: Experimental verification of Landauer's erasure principle
Sergio Ciliberto  1, *  , Antoine Bérut  1@  , Artem Petrosyan  1  
1 : Laboratoire de Physique de l'ENS Lyon  (Phys-ENS)  -  Website
CNRS : UMR5672, Ecole Normale Supérieure de Lyon
46 allée d'Italie 69007 Lyon -  France
* : Corresponding author

Rolf Landauer argued that the erasure of information is a dissipative process . A minimal quantity of heat, proportional to the thermal energy, is necessarily produced when a classical bit of information is deleted. A direct consequence of this logically irreversible transformation is that the entropy of the environment increases unavoidably by a finite amount. We experimentally show the existence of the Landauer bound in a generic model of a one-bit memory. Using a system of a single colloidal particle trapped in a modulated double-well potential, we establish that the mean dissipated heat saturates at the Landauer bound in the limit of long erasure cycles. This result demonstrates the intimate link between information theory and thermodynamics. For a memory erasure procedure, which is a logically irreversible operation, a detailed Jarzynski Equality is verified, retrieving the Landauer limit independently of the work done on the system.



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