<?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>S0035-001X2007001000008</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Quantum control with periodic sequences of non resonant pulses]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz y Cruz]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mielnik]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Cinvestav Departamento de Física ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,UPIITA-IPN Ciencias Basicas ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2007</year>
</pub-date>
<volume>53</volume>
<fpage>37</fpage>
<lpage>41</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2007001000008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2007001000008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2007001000008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The resonant quantum control techniques are vulnerable to cumulative errors specially if the manipulation operations involve many individual steps. It is shown that non trivial operations can be induced by non resonant fields challenging too simplified control models.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[El control cuántico resonante es sensible a la acumulación de errores, especialmente si el proceso involucra muchas operaciones individuales. Se muestra que, a través de campos externos no resonantes, se pueden inducir mecanismos no triviales de control que se contraponen a los modelos simplificados convencionales.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Quantum control]]></kwd>
<kwd lng="en"><![CDATA[time-dependent Hamiltonians]]></kwd>
<kwd lng="en"><![CDATA[periodical systems]]></kwd>
<kwd lng="es"><![CDATA[Control cuántico]]></kwd>
<kwd lng="es"><![CDATA[Hamiltonianos dependientes del tiempo]]></kwd>
<kwd lng="es"><![CDATA[sistemas periódicos]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="verdana" size="4"><b>Quantum control with periodic sequences of non resonant pulses</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>S. Cruz y Cruz<sup>a,b</sup> and B. Mielnik<sup>a</sup></b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>a</sup> Departamento de F&iacute;sica, Cinvestav, </i><i>Apartado Postal 14&#150;740 07000 M&eacute;xico D.F., M&eacute;xico,</i></font></p>     <p align="justify"><font face="verdana" size="2"><sup>b </sup><i>Ciencias Basicas, UPIITA&#150;IPN, Av. IPN 2580, 07340 M&eacute;xico D.F., M&eacute;xico, e&#150;mail: <a href="mailto:sara@fis.cinvestav.mx" target="_blank">sara@fis.cinvestav.mx</a>, <a href="mailto:bogdan@fis.cinvestav.mx" target="_blank">bogdan@fis.cinvestav.mx</a></i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 1 de mayo de 2006    <br>   Aceptado el 1 de noviembre de 2006</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">The resonant quantum control techniques are vulnerable to cumulative errors specially if the manipulation operations involve many individual steps. It is shown that non trivial operations can be induced by non resonant fields challenging too simplified control models.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Quantum control; time&#150;dependent Hamiltonians; periodical systems.</font></p>     <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">El control cu&aacute;ntico resonante es sensible a la acumulaci&oacute;n de errores, especialmente si el proceso involucra muchas operaciones individuales. Se muestra que, a trav&eacute;s de campos externos no resonantes, se pueden inducir mecanismos no triviales de control que se contraponen a los modelos simplificados convencionales.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Control cu&aacute;ntico; Hamiltonianos dependientes del tiempo; sistemas peri&oacute;dicos. </font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 03.65.Ta; 32.80.Qk</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v53s4/v53s4a8.pdf">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>Acknowledgments</b></font></p>     <p align="justify"><font face="verdana" size="2">The financial support of CONACyT projects 50766 and 49253&#150;F is acknowledged.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. W. Magnus, <i>Commun. Pure Appl. 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