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arXiv:0708.2781

Comment on "Direct Observation of Second Order Atom Tunnelling"

V. A. Kuz’menko

Published Aug 21, 2007• 0 citations
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Abstract

J.M.R. Parrondo at al. in arXiv:0904.1573 continue numerous efforts to unify the concepts of the arrow of time and entropy production with the concept of time invariance in physics. This is a wrong way.

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Irreversibility is one of the most intriguing concepts in physics.While microscopic physical laws are perfectly reversible, macroscopic average behavior has a preferred direction of time.According to the second law of thermodynamics, this arrow of time is associated with a positive mean entropy production.Using a nuclear magnetic resonance setup, we measure the nonequilibrium entropy produced in an isolated spin-1=2 system following fast quenches of an external magnetic field.We experimentally demonstrate that it is equal to the entropic distance, expressed by the Kullback-Leibler divergence, between a microscopic process and its time reversal.Our result addresses the concept of irreversibility from a microscopic quantum standpoint.
Irreversibility is one of the most intriguing concepts in physics. While microscopic physical laws are perfectly reversible, macroscopic average behavior has a preferred direction of time. According to the second law of thermodynamics, this arrow of time is associated with a positive mean entropy production. Using a nuclear magnetic resonance setup, we measure the nonequilibrium entropy produced in an isolated spin-1/2 system following fast quenches of an external magnetic field. We experimentally demonstrate that it is equal to the entropic distance, expressed by the Kullback-Leibler divergence, between a microscopic process and its time reversal. Our result addresses the concept of irreversibility from a microscopic quantum standpoint.