Revertendo a flecha termodinâmica do tempo: o passado foi o futuro que deixamos de viver no presente...

quinta-feira, dezembro 07, 2017

Reversing the thermodynamic arrow of time using quantum correlations

Kaonan Micadei, John P. S. Peterson, Alexandre M. Souza, Roberto S. Sarthour, Ivan S. Oliveira, Gabriel T. Landi, Tiago B. Batalhão, Roberto M. Serra, Eric Lutz
(Submitted on 9 Nov 2017)

Source/Fonte: Science News

The second law permits the prediction of the direction of natural processes, thus defining a thermodynamic arrow of time. However, standard thermodynamics presupposes the absence of initial correlations between interacting systems. We here experimentally demonstrate the reversal of the arrow of time for two initially quantum correlated spins-1/2, prepared in local thermal states at different temperatures, employing a Nuclear Magnetic Resonance setup. We observe a spontaneous heat flow from the cold to the hot system. This process is enabled by a trade off between correlations and entropy that we quantify with information-theoretical quantities.

Subjects: Quantum Physics (quant-ph); Statistical Mechanics (cond-mat.stat-mech)

Cite as: arXiv:1711.03323 [quant-ph]
  (or arXiv:1711.03323v1 [quant-ph] for this version)

Submission history
From: Roberto M. Serra [view email] 
[v1] Thu, 9 Nov 2017 11:13:20 GMT (1823kb,D)