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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.<\/jats:p>","DOI":"10.3390\/e18100346","type":"journal-article","created":{"date-parts":[[2016,9,23]],"date-time":"2016-09-23T07:32:37Z","timestamp":1474615957000},"page":"346","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Entropy for the Quantized Field in the Atom-Field Interaction: Initial Thermal Distribution"],"prefix":"10.3390","volume":"18","author":[{"given":"Luis","family":"Andrade-Morales","sequence":"first","affiliation":[{"name":"Instituto Nacional de Astrof\u00edsica, \u00d3ptica y Electr\u00f3nica, Calle Luis Enrique Erro No. 1, Tonantzintla 72840, Mexico"}]},{"given":"Braulio","family":"Villegas-Mart\u00ednez","sequence":"additional","affiliation":[{"name":"Instituto Nacional de Astrof\u00edsica, \u00d3ptica y Electr\u00f3nica, Calle Luis Enrique Erro No. 1, Tonantzintla 72840, Mexico"}]},{"given":"Hector","family":"Moya-Cessa","sequence":"additional","affiliation":[{"name":"Instituto Nacional de Astrof\u00edsica, \u00d3ptica y Electr\u00f3nica, Calle Luis Enrique Erro No. 1, Tonantzintla 72840, Mexico"}]}],"member":"1968","published-online":{"date-parts":[[2016,9,23]]},"reference":[{"key":"ref_1","unstructured":"Von Neumann, J. 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