{"id":115513,"date":"2014-09-04T00:00:00","date_gmt":"2014-09-04T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/quantum-metrology-with-unpolarized-atomic-ensembles\/"},"modified":"2014-09-04T00:00:00","modified_gmt":"2014-09-04T00:00:00","slug":"quantum-metrology-with-unpolarized-atomic-ensembles","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica-teorica\/quantum-metrology-with-unpolarized-atomic-ensembles\/","title":{"rendered":"Quantum metrology with unpolarized atomic ensembles"},"content":{"rendered":"<h2>Tesis doctoral de <strong> I\u00f1igo Urizar Lanz <\/strong><\/h2>\n<p>En la presente tesis se discuten los estados cu\u00e1nticos singlete de muchas part\u00edculas, es decir, estados cu\u00e1nticos de momento angular nulo para agregados at\u00f3micos con un n\u00famero elevado de part\u00edculas. Se da una definici\u00f3n para este concepto, se discuten sus principales caracter\u00edsticas y se presentan algunos ejemplos concretos de estados singlete multipart\u00edcula.Estos estados son particularmente adecuados para su utilizaci\u00f3n en tareas de magnetometr\u00eda diferencial, esto es, mediciones de la magnitud del gradiente de un campo magn\u00e9tico. Se describe un procedimiento en el cual se utiliza un \u00fanico agregado at\u00f3mico en un estado singlete para medir el gradiente de un campo magn\u00e9tico, y se discuten los resultados para varios perfiles de densidad de la nube at\u00f3mica. Posteriormente, se estudia la precisi\u00f3n con la que la medida del gradiente puede ser efectuada, obteni\u00e9ndose como resultado la m\u00e1xima alcanzable para este tipo de estados, siendo la magnitud a medir el gradiente del campo. Esta m\u00e1xima precisi\u00f3n viene dada por la magnitud llamada \u00c2\u00bfinformaci\u00f3n de fisher\u00c2\u00bf. Uno de los resultados obtenidos es la equiValencia de todos los estados singlete para este tipo de metrolog\u00eda, ya que la m\u00e1xima precisi\u00f3n alcanzable es la misma para todos ellos. Por \u00faltimo, se estudian algunos modelos en los que el estado inicial no es un singlete perfecto, sino que presenta alg\u00fan tipo de ruido. Los modelos estudiados dan como resultado una precisi\u00f3n nula para este par\u00e1metro en presencia de ruido.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Quantum metrology with unpolarized atomic ensembles<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Quantum metrology with unpolarized atomic ensembles <\/li>\n<li><strong>Autor:<\/strong>\u00a0 I\u00f1igo Urizar Lanz <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Pa\u00eds vasco\/euskal herriko unibertsitatea<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 09\/04\/2014<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>G\u00e9za T\u00f3th<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Juan  gonzalo Muga Francisco <\/li>\n<li>morgan Mitchell (vocal)<\/li>\n<li>otfried G\u00ed\u00bchne &#8212; (vocal)<\/li>\n<li>Juan  Jos\u00e9 Le\u00f3n Garc\u00eda (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de I\u00f1igo Urizar Lanz En la presente tesis se discuten los estados cu\u00e1nticos singlete de muchas part\u00edculas, es [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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