<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2008000500010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Medición la función de Wigner para campos electromagnéticos en cavidades]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Escudero Jiménez]]></surname>
<given-names><![CDATA[J.L.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moya-Cessa]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Astrofísica, Óptica y Electrónica  ]]></institution>
<addr-line><![CDATA[Puebla Pue]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2008</year>
</pub-date>
<volume>54</volume>
<numero>5</numero>
<fpage>397</fpage>
<lpage>399</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2008000500010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2008000500010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2008000500010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En esta contribución mostramos como la función de Wigner puede ser medida en cavidades, para esto estudiamos como pueden ser desplazados campos electromagnéticos cuantizados en cavidades. El desplazamiento de éstos es un ingrediente esencial en la reconstrucción de cuasi-probabilidades, y de esta forma en la medición de estados cuánticos de la luz.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[We show how the Wigner function may be measured for a quantum state of light. For this we show a form to displace fields inside cavities. Displacement of quantum fields is a key ingredient in quasi probability reconstruction processes, i.e. the measurement of quantum states of light.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Función de Wigner]]></kwd>
<kwd lng="es"><![CDATA[modelo de Jaynes y Cummings]]></kwd>
<kwd lng="en"><![CDATA[Wigner function]]></kwd>
<kwd lng="en"><![CDATA[Jaynes-Cummings model]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Medici&oacute;n la funci&oacute;n de Wigner para campos electromagn&eacute;ticos en cavidade</b>s</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>J.L. Escudero Jim&eacute;nez y H. Moya&#150;Cessa </b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Instituto Nacional de Astrof&iacute;sica, &Oacute;ptica y Electr&oacute;nica, Apartado Postal 51 y 216, 72000, Puebla, Pue., M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 3 de julio de 2008    <br> Aceptado el 4 de septiembre de 2008</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">En esta contribuci&oacute;n mostramos como la funci&oacute;n de Wigner puede ser medida en cavidades, para esto estudiamos como pueden ser desplazados campos electromagn&eacute;ticos cuantizados en cavidades. El desplazamiento de &eacute;stos es un ingrediente esencial en la reconstrucci&oacute;n de cuasi&#150;probabilidades, y de esta forma en la medici&oacute;n de estados cu&aacute;nticos de la luz.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Funci&oacute;n de Wigner; modelo de Jaynes y Cummings.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">We show how the Wigner function may be measured for a quantum state of light. For this we show a form to displace fields inside cavities. Displacement of quantum fields is a key ingredient in quasi probability reconstruction processes, <i>i.e. </i>the measurement of quantum states of light.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Wigner function; Jaynes&#150;Cummings model. </font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 42.50.&#150;p; 42.50.Ct; 42.50.Dv</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v54n5/v54n5a10.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. H. Moya&#150;Cessa, P.L. Knight y A. Rosenhouse&#150;Dantsker, <i>Phys. Rev. </i><b>50 </b>(1994) 1814.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8346707&pid=S0035-001X200800050001000001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">2. H. Moya&#150;Cessa y P. Tombesi, <i>Phys. Rev. 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