Experimental verification of Landauer's principle linking information and thermodynamics
Abstract
In 1961, Rolf Landauer argued that the erasure of information is a dissipative process. A minimal quantity of heat, proportional to the thermal energy and called the Landauer bound, 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 by a finite amount. Despite its fundamental importance for information theory and computer science, the erasure principle has not been verified experimentally so far, the main obstacle being the difficulty of doing singleparticle experiments in the lowdissipation regime. Here we experimentally show the existence of the Landauer bound in a generic model of a onebit memory. Using a system of a single colloidal particle trapped in a modulated doublewell 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. It further highlights the ultimate physical limit of irreversible computation.
 Publication:

Nature
 Pub Date:
 March 2012
 DOI:
 10.1038/nature10872
 Bibcode:
 2012Natur.483..187B