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Entropy 2016, 18(10), 346; doi:10.3390/e18100346

Entropy for the Quantized Field in the Atom-Field Interaction: Initial Thermal Distribution

Instituto Nacional de Astrofísica, Óptica y Electrónica, Calle Luis Enrique Erro No. 1, Tonantzintla 72840, Mexico
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Academic Editor: Antonio M. Scarfone
Received: 23 August 2016 / Revised: 19 September 2016 / Accepted: 21 September 2016 / Published: 23 September 2016
(This article belongs to the Collection Advances in Applied Statistical Mechanics)
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Abstract

We study the entropy of a quantized field in interaction with a two-level atom (in a pure state) when the field is initially in a mixture of two number states. We then generalise the result for a thermal state; i.e., an (infinite) statistical mixture of number states. We show that for some specific interaction times, the atom passes its purity to the field and therefore the field entropy decreases from its initial value. View Full-Text
Keywords: von Neumann entropy; mixed states; purity von Neumann entropy; mixed states; purity
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Andrade-Morales, L.A.; Villegas-Martínez, B.M.; Moya-Cessa, H.M. Entropy for the Quantized Field in the Atom-Field Interaction: Initial Thermal Distribution. Entropy 2016, 18, 346.

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