{"id":2236,"date":"2010-05-07T17:37:22","date_gmt":"2010-05-07T15:37:22","guid":{"rendered":"http:\/\/localhost\/azgad\/wordpress\/?p=2236"},"modified":"2010-05-07T17:37:22","modified_gmt":"2010-05-07T15:37:22","slug":"artificial-atoms-light-up","status":"publish","type":"post","link":"https:\/\/azgad.com\/?p=2236","title":{"rendered":"Artificial atoms light up"},"content":{"rendered":"<p><a href='https:\/\/azgad.com\/wp-content\/uploads\/\/Doc2.docx'>Doc2<\/a><\/p>\n<p><strong>A superconducting circuit that strongly interacts with light paves the way<br \/>\nfor optical computing schemes<\/strong><br \/>\n.<\/p>\n<p>.<br \/>\nBefore a quantum effect such as resonance fluorescence\u2014resulting<br \/>\n from the interaction of light with atoms\u2014can be applied to quantum<br \/>\ncomputing schemes, scientists need to replicate it in the laboratory.<br \/>\n Thus far, however, efforts using artificial atoms made from superconducting<br \/>\n circuits have been unsuccessful. Now, resonance fluorescence of a single<br \/>\n artificial atom has been demonstrated by researchers from the NEC Nano<br \/>\nElectronics Laboratory in Tsukuba and the RIKEN Advanced Science<br \/>\nInstitute in Wako.<br \/>\n.<br \/>\nResonance fluorescence occurs when a light beam with an energy<br \/>\nthat matches an atom\u2019s resonance energy gets absorbed by the atom<br \/>\nand then re-emitted in random directions. As resonance fluorescence can<br \/>\n be used to couple two photons, or light particles, scientists are keen to<br \/>\n exploit this effect in quantum computing operations. However, this effect<br \/>\n in atoms is too small to be useful for practical applications since photons<br \/>\n and atoms interact very weakly due to their small size, according to Jaw-Shen<br \/>\nTsai, who led the research team.<br \/>\n.<\/p>\n<p>To circumvent this problem, researchers created artificial atoms on computer<br \/>\n chips (Fig. 1), where the interaction between light and the artificial atom can<br \/>\n be optimized. \u201cWith a solid-state device such as ours, made from superconducting<br \/>\n circuits, the coupling can be very strong,\u201d says Tsai.<br \/>\n.<\/p>\n<p>Earlier attempts by researchers in the field to observe resonant fluorescence<br \/>\nin artificial atoms resulted in low efficiencies of around 12%, owing to poor re-emission<br \/>\n of the absorbed light by these atoms. To enhance the re-emission process, the<br \/>\n researchers used a one-dimensional waveguide coupled to the artificial atom. This<br \/>\n resulted in an efficient re-emission of light from the artificial atom because in the<br \/>\n waveguide the light is channelled in only two directions. Tsai and colleagues<br \/>\n demonstrated that about 94% of the incoming light at the resonance frequency<br \/>\nof the superconducting circuit was absorbed and re-emitted.<br \/>\n.<\/p>\n<p>By building on this strong interaction between incoming light and the artificial atom<br \/>\n a number of potential applications are now possible, according to Tsai. \u201cThere<br \/>\n are a whole series of experiments one can do, for example towards photon-based<br \/>\n quantum computing,\u201d he says. The absorption of a photon by an artificial atom, for<br \/>\n example, could be used to control the propagation of a second photon along the<br \/>\n waveguide, owing to the non-linear nature of the interaction of light with the artificial<br \/>\n atom, Tsai explains.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Doc2 A superconducting circuit that strongly interacts with light paves the way for optical computing schemes . . Before a quantum effect such as resonance fluorescence\u2014resulting from the interaction of light with atoms\u2014can be applied to quantum computing schemes, scientists need to replicate it in the laboratory. Thus far, however, efforts using artificial atoms made &hellip; <\/p>\n<p><a class=\"more-link btn\" href=\"https:\/\/azgad.com\/?p=2236\">\u05d4\u05de\u05e9\u05d9\u05db\u05d5 \u05d1\u05e7\u05e8\u05d9\u05d0\u05d4<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[10],"tags":[261,513,49,260],"class_list":["post-2236","post","type-post","status-publish","format-standard","hentry","category-10","tag-261","tag-513","tag-49","tag-260","nodate","item-wrap"],"_links":{"self":[{"href":"https:\/\/azgad.com\/index.php?rest_route=\/wp\/v2\/posts\/2236","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/azgad.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/azgad.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/azgad.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/azgad.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2236"}],"version-history":[{"count":4,"href":"https:\/\/azgad.com\/index.php?rest_route=\/wp\/v2\/posts\/2236\/revisions"}],"predecessor-version":[{"id":2241,"href":"https:\/\/azgad.com\/index.php?rest_route=\/wp\/v2\/posts\/2236\/revisions\/2241"}],"wp:attachment":[{"href":"https:\/\/azgad.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2236"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/azgad.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2236"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/azgad.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}