{"id":709,"date":"2015-05-19T20:13:00","date_gmt":"2015-05-19T18:13:00","guid":{"rendered":"https:\/\/gqm.lpl.univ-paris13.fr\/?p=709"},"modified":"2025-11-08T20:56:56","modified_gmt":"2025-11-08T19:56:56","slug":"cooling-of-a-bose-einstein-condensate-by-spin-distillation","status":"publish","type":"post","link":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2015\/05\/19\/cooling-of-a-bose-einstein-condensate-by-spin-distillation\/","title":{"rendered":"Cooling of a Bose-Einstein condensate by spin distillation"},"content":{"rendered":"\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 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>Our scheme starts with a BEC polarized in the lowest energy spin state. Spin excited states are thermally populated by lowering the single particle energy gap set by the magnetic field. Then, these spin-excited thermal components are filtered out, which leads to an increase of the BEC fraction. We experimentally demonstrate such cooling for a spin 3 <sup>52<\/sup>Cr dipolar BEC.<\/p>\n\n\n\n<p>Our scheme should be applicable to Na or Rb, with the perspective to reach temperatures below 1&nbsp;nK.<\/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-88346899\" 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-Spin-distillation-eac6e8.svg\" alt=\"\" class=\"wp-image-1682\" style=\"border-style:none;border-width:0px;border-radius:10px\"\/><figcaption class=\"wp-element-caption\">a) Principle of the proposal. b) Density profiles after depolarization and Stern Gerlach procedure showing a 52Cr BEC forming only in ms = \u22123. c) Purification of a 52 Cr BEC.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>We propose and experimentally demonstrate a new cooling mechanism leading to purification of a Bose-Einstein condensate (BEC).<br \/>\n<a href=\"https:\/\/doi.org\/10.48550\/arXiv.1505.05098\">arXiv:1505.05098 (2015)<\/a>  \/  <a href=\"https:\/\/doi.org\/10.1103\/PhysRevLett.115.243002\">Phys. Rev. Lett. 115, 243002 (2015)<\/a><\/p>\n","protected":false},"author":3,"featured_media":1682,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[18,63,129],"tags":[26,153,31,30,61,42,44],"class_list":["post-709","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-article","category-chromium","category-theory","tag-bruno-laburthe-tolra","tag-bruno-naylor","tag-etienne-marechal","tag-john-h-huckans","tag-laurent-vernac","tag-olivier-gorceix","tag-paolo-pedri"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cooling of a Bose-Einstein condensate by spin distillation - 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\/2015\/05\/19\/cooling-of-a-bose-einstein-condensate-by-spin-distillation\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cooling of a Bose-Einstein condensate by spin distillation - Magnetic Quantum Gases\" \/>\n<meta property=\"og:description\" content=\"We propose and experimentally demonstrate a new cooling mechanism leading to purification of a Bose-Einstein condensate (BEC). arXiv:1505.05098 (2015) \/ Phys. Rev. Lett. 115, 243002 (2015)\" \/>\n<meta property=\"og:url\" content=\"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2015\/05\/19\/cooling-of-a-bose-einstein-condensate-by-spin-distillation\/\" \/>\n<meta property=\"og:site_name\" content=\"Magnetic Quantum Gases\" \/>\n<meta property=\"article:published_time\" content=\"2015-05-19T18:13:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-11-08T19:56:56+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\\\/2015\\\/05\\\/19\\\/cooling-of-a-bose-einstein-condensate-by-spin-distillation\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2015\\\/05\\\/19\\\/cooling-of-a-bose-einstein-condensate-by-spin-distillation\\\/\"},\"author\":{\"name\":\"Benjamin PASQUIOU\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#\\\/schema\\\/person\\\/edd1441f419c30858a44ed007fc1fc79\"},\"headline\":\"Cooling of a Bose-Einstein condensate by spin distillation\",\"datePublished\":\"2015-05-19T18:13:00+00:00\",\"dateModified\":\"2025-11-08T19:56:56+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2015\\\/05\\\/19\\\/cooling-of-a-bose-einstein-condensate-by-spin-distillation\\\/\"},\"wordCount\":113,\"publisher\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2015\\\/05\\\/19\\\/cooling-of-a-bose-einstein-condensate-by-spin-distillation\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/wp-content\\\/uploads\\\/2025\\\/11\\\/Article-Spin-distillation-eac6e8.svg\",\"keywords\":[\"Bruno Laburthe-Tolra\",\"Bruno Naylor\",\"Etienne Mar\u00e9chal\",\"John H. 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