{"id":98560,"date":"2018-03-11T10:19:21","date_gmt":"2018-03-11T10:19:21","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/interfacing-single-ions-and-single-photons-for-quantum-networks\/"},"modified":"2018-03-11T10:19:21","modified_gmt":"2018-03-11T10:19:21","slug":"interfacing-single-ions-and-single-photons-for-quantum-networks","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/politecnica-de-catalunya\/interfacing-single-ions-and-single-photons-for-quantum-networks\/","title":{"rendered":"Interfacing single ions and single photons for quantum networks"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Carsten Schuck <\/strong><\/h2>\n<p>Experiments in quantum optics are motivated by fundamental  questions about the quantum mechanical description of matter and light as  well as by applications in quantum technologies such as quantum information processing. Exploiting the quantum character  of both matter  and light has turned out to be extremely rewarding for novel technological applications in the emerging fields of quantum communication  and computation. Here we consider the implementation of quantum information technology with trapped ions and single photons, focusing  on two key issues: the entanglement of distant atoms and the controlled interaction of a single photon with a single atom.    this thesis describes the construction of a double ion trap apparatus including the necessary frequency-stabilized laser  systems, and first  experiments to investigate the generation of distant atomic entanglement, the implementation of a simple quantum network and controlled  single-atom single-photon interaction. The experimental setup comprises two ion traps at a distance of one meter, which are independent  but identical in construction. We introduce novel realizations of a photoionization method for calcium atoms, a laser frequency stabilization  scheme and a radio frequency pulse sequencer. Linear paul traps are used to load individual or strings of calcium ions. High-numerical   aperture objectives mounted on sub-micrometer positioning systems allow us to address and manipulate a single ion with strongly focused  light fields and collect the emitted fluorescence photons from a large solid angle. With these bidirectional single-atom single-photon  interfaces the essential building blocks of a quantum network with atoms and photons are available.     one of the main objectives we pursue with the double-trap apparatus is the generation of entanglement between ions in different traps,  which is one of the key tasks in a quantum network. We compare single- and two-photon schemes for probabilistic entanglement creation  and analyze how the  performance of the schemes depends on photon detection efficiency.  As a first step towards the experimental  realization of such schemes we measure the second order correlation function of  fluorescence photons emitted from two distant trapped  ions. We observe high-contrast quantum (hong-ou-mandel) interference, proving the indistinguishability of photons emitted from different   ions, which is a prerequisite for the considered entanglement schemes.     to investigate the interaction of single photons and a single atom in free space we combine the ion trap apparatus with a tunable,   narrowband spontaneous parametric down-conversion source. The high-numerical aperture objectives allow us to efficiently couple   bandwidth-tunable photons to a single trapped ion. Such atom-photon interaction at the single-particle level is the most fundamental  process in quantum optics and lies literally at the focus of many experimental implementations  of quantum information processing protocols  and of studies of the (quantum) limits of matter -light interaction, which were so far restricted to weak coherent light fields. Here we observe  individual atomic absorption events of one photon of an entangled pair by employing a quantum jump detection scheme. To characterize  and control the interaction process we modify the spectral properties of the down conversion photons and perform single-photon  spectroscopy of a single ion. To go beyond experiments with cohe rent fields we study temporal correlations between the absorption of  photons  from the spontaneous parametric down conversion source by a single ion and the detection of the corresponding partner photon.  for the applied scheme we observe promising indications that the quantum correlations of photons produced in spontaneous parametric  down conversion are preserved in the resonant interaction with a single atom. The implementation of more efficient atom-light coupling and  entanglement transfer schemes with our apparatus is outlined.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Interfacing single ions and single photons for quantum networks<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Interfacing single ions and single photons for quantum networks <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Carsten Schuck <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de catalunya<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 13\/01\/2010<\/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>J\u00c1\u00bcrgen Eschner<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: niek f. Van hulst <\/li>\n<li>christian Kurtsiefer (vocal)<\/li>\n<li>david Lucas (vocal)<\/li>\n<li>caroline Champenois (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Carsten Schuck Experiments in quantum optics are motivated by fundamental questions about the quantum mechanical description of [&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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[15596],"tags":[201516,201513,201514,201515,197952,119206],"class_list":["post-98560","post","type-post","status-publish","format-standard","hentry","category-politecnica-de-catalunya","tag-caroline-champenois","tag-carsten-schuck","tag-christian-kurtsiefer","tag-david-lucas","tag-jargen-eschner","tag-niek-f-van-hulst"],"_links":{"self":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/98560","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/comments?post=98560"}],"version-history":[{"count":0,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/98560\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/media?parent=98560"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/categories?post=98560"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/tags?post=98560"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}