{"id":1530,"date":"2007-11-05T22:15:00","date_gmt":"2007-11-05T21:15:00","guid":{"rendered":"https:\/\/gqm.lpl.univ-paris13.fr\/?p=1530"},"modified":"2025-11-08T13:51:48","modified_gmt":"2025-11-08T12:51:48","slug":"averaging-out-magnetic-forces-with-fast-rf-sweeps-in-an-optical-trap-for-metastable-chromium-atoms","status":"publish","type":"post","link":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2007\/11\/05\/averaging-out-magnetic-forces-with-fast-rf-sweeps-in-an-optical-trap-for-metastable-chromium-atoms\/","title":{"rendered":"Averaging out magnetic forces with fast RF sweeps in an optical trap for metastable chromium atoms"},"content":{"rendered":"\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-995f960e wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<p class=\"wp-block-paragraph\">In our experiment, fast radio-frequency linear sweeps flip the spins of atoms at a fast rate, which averages out the magnetic forces.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We use this procedure to optimize the accumulation of metastable chromium atoms in an optical dipole trap from a magneto-optical trap.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The potential experienced by the metastable atoms is identical to the bare optical dipole potential, so that this procedure allows for trapping all magnetic sublevels, hence increasing by up to 80% the final number of accumulated atoms.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<figure class=\"wp-block-image aligncenter size-full has-custom-border is-style-rounded wp-duotone-unset-1\" id=\"wp-block-themeisle-blocks-image-8e048229\" style=\"margin-top:var(--wp--preset--spacing--20);margin-right:var(--wp--preset--spacing--20);margin-bottom:var(--wp--preset--spacing--20);margin-left:var(--wp--preset--spacing--20)\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/gqm.lpl.univ-paris13.fr\/wp-content\/uploads\/2025\/11\/Article-Averaging-out-magnetic-forces-1b54b2.svg\" alt=\"\" class=\"wp-image-1602\" style=\"border-style:none;border-width:0px;border-radius:10px\"\/><figcaption class=\"wp-element-caption\">Steady-state atom number in the OT as a function of the mean RF power, for RF frequency sweeps between 500 kHz and 7 MHz, at a rate of 10 kHz.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>We introduce a time-averaged trap in which the internal state of the atoms is rapidly modulated to modify the magnetic trapping potential.<br \/>\n<a href=\"https:\/\/doi.org\/10.48550\/arXiv.0711.0663\">arXiv:0711.0663 (2007)<\/a>  \/  <a href=\"https:\/\/doi.org\/10.1103\/PhysRevA.77.053413\">Phys. Rev. A 77, 053413 (2008)<\/a><\/p>\n","protected":false},"author":3,"featured_media":1602,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[18,63],"tags":[147,26,31,281,61,42,151,149,271,283],"class_list":["post-1530","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-article","category-chromium","tag-arnaud-pouderous","tag-bruno-laburthe-tolra","tag-etienne-marechal","tag-jean-claude-keller","tag-laurent-vernac","tag-olivier-gorceix","tag-quentin-beaufils","tag-radu-chicireanu","tag-thomas-zanon","tag-w-de-souza-melo"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":7}},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Averaging out magnetic forces with fast RF sweeps in an optical trap for metastable chromium atoms - Magnetic Quantum Gases<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2007\/11\/05\/averaging-out-magnetic-forces-with-fast-rf-sweeps-in-an-optical-trap-for-metastable-chromium-atoms\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Averaging out magnetic forces with fast RF sweeps in an optical trap for metastable chromium atoms - Magnetic Quantum Gases\" \/>\n<meta property=\"og:description\" content=\"We introduce a time-averaged trap in which the internal state of the atoms is rapidly modulated to modify the magnetic trapping potential. arXiv:0711.0663 (2007) \/ Phys. 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A 77, 053413 (2008)\" \/>\n<meta property=\"og:url\" content=\"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2007\/11\/05\/averaging-out-magnetic-forces-with-fast-rf-sweeps-in-an-optical-trap-for-metastable-chromium-atoms\/\" \/>\n<meta property=\"og:site_name\" content=\"Magnetic Quantum Gases\" \/>\n<meta property=\"article:published_time\" content=\"2007-11-05T21:15:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-11-08T12:51:48+00:00\" \/>\n<meta name=\"author\" content=\"Benjamin PASQUIOU\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Benjamin PASQUIOU\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2007\\\/11\\\/05\\\/averaging-out-magnetic-forces-with-fast-rf-sweeps-in-an-optical-trap-for-metastable-chromium-atoms\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2007\\\/11\\\/05\\\/averaging-out-magnetic-forces-with-fast-rf-sweeps-in-an-optical-trap-for-metastable-chromium-atoms\\\/\"},\"author\":{\"name\":\"Benjamin PASQUIOU\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#\\\/schema\\\/person\\\/edd1441f419c30858a44ed007fc1fc79\"},\"headline\":\"Averaging out magnetic forces with fast RF sweeps in an optical trap for metastable chromium atoms\",\"datePublished\":\"2007-11-05T21:15:00+00:00\",\"dateModified\":\"2025-11-08T12:51:48+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2007\\\/11\\\/05\\\/averaging-out-magnetic-forces-with-fast-rf-sweeps-in-an-optical-trap-for-metastable-chromium-atoms\\\/\"},\"wordCount\":122,\"publisher\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2007\\\/11\\\/05\\\/averaging-out-magnetic-forces-with-fast-rf-sweeps-in-an-optical-trap-for-metastable-chromium-atoms\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/wp-content\\\/uploads\\\/2025\\\/11\\\/Article-Averaging-out-magnetic-forces-1b54b2.svg\",\"keywords\":[\"Arnaud Pouderous\",\"Bruno Laburthe-Tolra\",\"Etienne Mar\u00e9chal\",\"Jean-Claude Keller\",\"Laurent Vernac\",\"Olivier Gorceix\",\"Quentin Beaufils\",\"Radu Chicireanu\",\"Thomas Zanon\",\"W. de Souza Melo\"],\"articleSection\":[\"Article\",\"Chromium\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2007\\\/11\\\/05\\\/averaging-out-magnetic-forces-with-fast-rf-sweeps-in-an-optical-trap-for-metastable-chromium-atoms\\\/\",\"url\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2007\\\/11\\\/05\\\/averaging-out-magnetic-forces-with-fast-rf-sweeps-in-an-optical-trap-for-metastable-chromium-atoms\\\/\",\"name\":\"Averaging out magnetic forces with fast RF sweeps in an optical trap for metastable chromium atoms - 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