{"id":2306,"date":"2026-03-09T13:23:52","date_gmt":"2026-03-09T12:23:52","guid":{"rendered":"https:\/\/gqm.lpl.univ-paris13.fr\/?p=2306"},"modified":"2026-03-11T18:10:15","modified_gmt":"2026-03-11T17:10:15","slug":"using-dynamical-decoupling-to-investigate-magnetism-of-large-spin-atoms","status":"publish","type":"post","link":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2026\/03\/09\/using-dynamical-decoupling-to-investigate-magnetism-of-large-spin-atoms\/","title":{"rendered":"Using dynamical decoupling to investigate magnetism of large-spin atoms"},"content":{"rendered":"\n
\n
\n

We present a detailed investigation of itinerant magnetism in a dipolar Bose gas of chromium atoms confined in a three-dimensional optical lattice, expanding on results recently reported in Phys. Rev. Lett. 136<\/strong>, 103401 (2026)<\/a>.<\/p>\n\n\n\n

In the low-entropy, near-unit filling regime, we employ advanced dynamical decoupling techniques to suppress magnetic-field noise and probe spin coherence across the superfluid\u2013Mott insulator transition.<\/p>\n\n\n\n

We provide a systematic comparison of different dynamical decoupling sequences, analyze their robustness to experimental imperfections, and quantify their impact on spin dynamics. We also develop perturbative and effective-model approaches that capture the role of both contact and dipolar interactions in determining spin coherence.<\/p>\n\n\n\n

In the superfluid regime, we discuss a hydrodynamic description that elucidates the emergence and breakdown of metastable ferromagnetism. In the insulating regime, we derive effective spin models including superexchange terms. In this limit, we introduce a tractable spin-1 toy model and a short-time expansion of the full spin-3 dynamics that help to shed insight on the interplay between dipolar and contact-driven superexchange dynamics observed experimentally for spin-3.<\/p>\n\n\n\n

Our comprehensive analysis bridges experiment and theory, providing new tools and perspectives for understanding itinerant dipolar magnetism in optical lattices.<\/p>\n<\/div>\n\n\n\n

\n
\"\"
Top: dynamical decoupling (DD) sequences that we have studied. The Ramsey sequence is complemented by a series of \u03c0 pulses separated by a duration T . \u03c0x,y represent rotations of an angle \u2248\u03c0 around the X or Y axis. Bottom: DD outcomes. Open red symbols are obtained without DD. \u201cX\u201d sequence (where \u03c0x pulses are repeatedly applied) does not preserve coherence long enough (open orange symbols), unlike \u201cY\u201d sequence (repeated \u03c0y pulses, solid green symbols).<\/figcaption><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

In the low-entropy, near-unit filling regime, we employ advanced dynamical decoupling techniques to suppress magnetic-field noise and probe spin coherence across the superfluid\u2013Mott insulator transition. Phys. Rev. A 113, 033306 (2026) <\/a><\/p>\n","protected":false},"author":3,"featured_media":2321,"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],"tags":[57,26,342,61,323,341],"class_list":["post-2306","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-article","category-chromium","tag-ana-maria-rey","tag-bruno-laburthe-tolra","tag-jose-daniel-bernal","tag-laurent-vernac","tag-thomas-laupretre","tag-youcef-baamara"],"blocksy_meta":[],"yoast_head":"\nUsing dynamical decoupling to investigate magnetism of large-spin 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\/2026\/03\/09\/using-dynamical-decoupling-to-investigate-magnetism-of-large-spin-atoms\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Using dynamical decoupling to investigate magnetism of large-spin atoms - Magnetic Quantum Gases\" \/>\n<meta property=\"og:description\" content=\"In the low-entropy, near-unit filling regime, we employ advanced dynamical decoupling techniques to suppress magnetic-field noise and probe spin coherence across the superfluid\u2013Mott insulator transition. Phys. Rev. A 113, 033306 (2026)\" \/>\n<meta property=\"og:url\" content=\"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2026\/03\/09\/using-dynamical-decoupling-to-investigate-magnetism-of-large-spin-atoms\/\" \/>\n<meta property=\"og:site_name\" content=\"Magnetic Quantum Gases\" \/>\n<meta property=\"article:published_time\" content=\"2026-03-09T12:23:52+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-11T17:10:15+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/gqm.lpl.univ-paris13.fr\/wp-content\/uploads\/2026\/03\/Article-Using-dynamical-decoupling-v2.png\" \/>\n\t<meta property=\"og:image:width\" content=\"600\" \/>\n\t<meta property=\"og:image:height\" content=\"600\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\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=\"2 minutes\" \/>\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\\\/2026\\\/03\\\/09\\\/using-dynamical-decoupling-to-investigate-magnetism-of-large-spin-atoms\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2026\\\/03\\\/09\\\/using-dynamical-decoupling-to-investigate-magnetism-of-large-spin-atoms\\\/\"},\"author\":{\"name\":\"Benjamin PASQUIOU\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#\\\/schema\\\/person\\\/edd1441f419c30858a44ed007fc1fc79\"},\"headline\":\"Using dynamical decoupling to investigate magnetism of large-spin atoms\",\"datePublished\":\"2026-03-09T12:23:52+00:00\",\"dateModified\":\"2026-03-11T17:10:15+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2026\\\/03\\\/09\\\/using-dynamical-decoupling-to-investigate-magnetism-of-large-spin-atoms\\\/\"},\"wordCount\":270,\"publisher\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2026\\\/03\\\/09\\\/using-dynamical-decoupling-to-investigate-magnetism-of-large-spin-atoms\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/Article-Using-dynamical-decoupling-v2.png\",\"keywords\":[\"Ana Maria Rey\",\"Bruno Laburthe-Tolra\",\"Jose Daniel Bernal\",\"Laurent Vernac\",\"Thomas Laupr\u00eatre\",\"Youcef Baamara\"],\"articleSection\":[\"Article\",\"Chromium\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2026\\\/03\\\/09\\\/using-dynamical-decoupling-to-investigate-magnetism-of-large-spin-atoms\\\/\",\"url\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2026\\\/03\\\/09\\\/using-dynamical-decoupling-to-investigate-magnetism-of-large-spin-atoms\\\/\",\"name\":\"Using dynamical decoupling to investigate magnetism of large-spin atoms - Magnetic Quantum Gases\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2026\\\/03\\\/09\\\/using-dynamical-decoupling-to-investigate-magnetism-of-large-spin-atoms\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2026\\\/03\\\/09\\\/using-dynamical-decoupling-to-investigate-magnetism-of-large-spin-atoms\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/Article-Using-dynamical-decoupling-v2.png\",\"datePublished\":\"2026-03-09T12:23:52+00:00\",\"dateModified\":\"2026-03-11T17:10:15+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2026\\\/03\\\/09\\\/using-dynamical-decoupling-to-investigate-magnetism-of-large-spin-atoms\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2026\\\/03\\\/09\\\/using-dynamical-decoupling-to-investigate-magnetism-of-large-spin-atoms\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2026\\\/03\\\/09\\\/using-dynamical-decoupling-to-investigate-magnetism-of-large-spin-atoms\\\/#primaryimage\",\"url\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/Article-Using-dynamical-decoupling-v2.png\",\"contentUrl\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/Article-Using-dynamical-decoupling-v2.png\",\"width\":600,\"height\":600,\"caption\":\"Top: dynamical decoupling (DD) sequences that we have studied. 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