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@ Nature Communications: Reversion of heat flow using quantum correlations

June 5, 2019

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@PRL Irreversibility and the emergence of the arrow of time in quantum systems

June 27, 2016

Entropy production, a quantity associated with the emergence of the arrow of time, has been successfully measured in a microscopic quantum system. 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 and experimentally demonstrate that it is equal to the entropic distance, expressed by the Kullback-Leibler divergence, between a microscopic process and its time-reverse. Our result addresses the concept of irreversibility from a microscopic quantum standpoint.

 

Read more: Physical Review Letters, 115, 190601 (2015) - highlighted as Editors' Suggestion

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Physics World (IOP): Physicists put the arrow of time under a quantum microscope

Physics (APS): Viewpoint: Nuclear Spin Points out Arrow of Time

Revista Pesquisa (FAPESP): Desordem irreversível no mundo dos átomos | PDF | Irreversible disorder in the world of atoms

PhysOrg: Physicists confirm thermodynamic irreversibility in a quantum system

Agência FAPESP: Seta do tempo é comprovada em nível molecular | Proof of time’s arrow at the atomic level

Destaque em Física (SBF): A seta do tempo em sistemas quânticos

 

 

 

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