{"id":26108,"date":"2024-08-13T15:11:29","date_gmt":"2024-08-13T13:11:29","guid":{"rendered":"https:\/\/www.uni.lu\/fstm-en\/?post_type=news&#038;p=26108"},"modified":"2024-08-13T15:24:48","modified_gmt":"2024-08-13T13:24:48","slug":"what-makes-an-atom-giant","status":"publish","type":"news","link":"https:\/\/www.uni.lu\/fstm-en\/news\/what-makes-an-atom-giant\/","title":{"rendered":"What makes an atom giant?"},"content":{"rendered":"\n<section class=\"wp-block-unilux-blocks-free-section section\"><div class=\"container xl:max-w-screen-xl\">\n<p>Physicists from the Universities of Luxembourg and Ulm have investigated the properties of chiral giant atoms in waveguide quantum electrodynamics.<\/p>\n\n\n\n<p>Giant atoms in waveguide quantum electrodynamics are artificial atoms (e.g., superconducting qubits) coupled at multiple spatially separated points to a waveguide. This regime induces already remarkable phenomena, such as single-atom non-exponential emission and decoherence-free interaction between many giant atoms.<\/p>\n\n\n\n<p>The nonlocal nature of their couplings offers the possibility of introducing an artificial magnetic field through complex atom-waveguide couplings. This technology allows the fabrication of &#8216;chiral&#8217; giant atoms, that is, systems which break time-reversal symmetry and are able to undergo directional emission.<\/p>\n\n\n\n<p>In their study, <a href=\"https:\/\/www.linkedin.com\/in\/federico-roccati-885470108\/en\">Dr. Federico Roccati<\/a>, posdoctoral researcher at the University of Luxembourg and now Fulbright Fellow at Columbia University (<a href=\"https:\/\/www.uni.lu\/fstm-en\/news\/first-fullbright-scholarship-granted-in-physics\/\">thanks to the prestigious scholarship he received in 2023<\/a>) and <a href=\"https:\/\/de.linkedin.com\/in\/dario-cilluffo-2a19a4179\">Dr. Dario Cilluffo<\/a>, postdoctoral researcher at Ulm University, found a remarkable feature of chiral giant atoms: by tuning the complex phases of the atom-waveguide couplings, it is possible to control the Markovianity of atomic emission. <\/p>\n\n\n\n<p>Remarkably, they found an optimal phase configuration for which a giant atom undergoes spontaneous emission regardless of the distance between the coupling points (which, in the standard case, controls the Markovianity). In turn, the effect showcased in their study shows that the defining feature of giant atoms is the non-local nature of their couplings, rather than their non-Markovian character.<\/p>\n\n\n\n<p>Publication: &#8220;<a href=\"https:\/\/journals.aps.org\/prl\/abstract\/10.1103\/PhysRevLett.133.063603\">Controlling Markovianity with Chiral Giant Atoms<\/a>&#8220;, Physical Review Letters, August 2024<\/p>\n\n\n<ul class=\"flex flex-wrap mt-24 -mx-16  wp-block-unilux-blocks-free-content-card\">\n    <li class=\"w-full sm:w-1\/2 lg:w-1\/3 px-16  wp-block-unilux-blocks-free-content-card-item\">\n    <div class=\"ulux-card card-people bg-theme\">\n        <div class=\"ulux-card__container card__container\">\n                        <div class=\"ulux-card__visual wp-block-unilux-blocks-free-content-card-item-visual\">\n    \n<div class=\"wp-block-unilux-blocks-image-video-wrapper\">\n    <figure class=\"wp-block-dev4-reusable-blocks-image  object-fit--cover\">\n    \n<img decoding=\"async\" class=\"wp-block-image unilux-custom-image-block\"\n                alt=\"\"\n            src=\"https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/08\/Federico-scaled.jpg\"\n                srcset=\"https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/08\/Federico-200x300.jpg 200w, https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/08\/Federico-683x1024.jpg 683w, https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/08\/Federico-768x1152.jpg 768w, https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/08\/Federico-1024x1536.jpg 1024w, https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/08\/Federico-1365x2048.jpg 1365w, https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/08\/Federico-scaled.jpg 1707w\"\n                style=\"object-position: 48.00% 30.00%; font-family: &quot;object-fit: cover; object-position: 48.00% 30.00%;&quot;; aspect-ratio: 4\/3; object-fit: cover; width: 100%;\"\n        loading=\"lazy\"\n\/>    <\/figure><\/div><\/div><div class=\"ulux-card__body wp-block-unilux-blocks-free-content-card-item-body\">\n    \n<div class=\"card__activity wp-block-unilux-blocks-plain-text\"><\/div>\n<h3 class=\"card__name has-text-align-left wp-block-unilux-blocks-heading\"        id=\"federico-roccati\"\n    >\nFederico Roccati<\/h3>\n\n<div class=\"card__organization wp-block-unilux-blocks-plain-text\">Columbia University<\/div>\n<div class=\"card__function wp-block-unilux-blocks-plain-text\">Fulbright Fellow<\/div>\n<div class=\"card__interest wp-block-unilux-blocks-plain-text\"><\/div><div class=\"ulux-card__link-wrapper card__link wp-block-unilux-blocks-simple-cta\">\n    <a\n        href=\"https:\/\/www.linkedin.com\/in\/federico-roccati-885470108\/en\"\n        title=\"Learn more\"\n        class=\"link-text link-text--icon ulux-card__link link-text link-absolute\"\n        target=\"_blank\"\n    >\n        <span class=\"link-text__body\">\n            <span class=\"link-text__name\">Learn more<\/span>\n        <\/span>\n        <svg aria-hidden=\"true\" focusable=\"false\" class=\"icon icon-outline icon--external-link \"><use xlink:href=\"https:\/\/www.uni.lu\/wp-content\/themes\/unilux-theme\/assets\/images\/icons\/icons-outline.svg#icon--external-link\"><\/use><\/svg>    <\/a>\n<\/div>\n<\/div>        <\/div>\n    <\/div>\n<\/li><li class=\"w-full sm:w-1\/2 lg:w-1\/3 px-16  wp-block-unilux-blocks-free-content-card-item\">\n    <div class=\"ulux-card card-people bg-theme\">\n        <div class=\"ulux-card__container card__container\">\n                        <div class=\"ulux-card__visual wp-block-unilux-blocks-free-content-card-item-visual\">\n    \n<div class=\"wp-block-unilux-blocks-image-video-wrapper\">\n    <figure class=\"wp-block-dev4-reusable-blocks-image  object-fit--cover\">\n    \n<img decoding=\"async\" class=\"wp-block-image unilux-custom-image-block\"\n                alt=\"\"\n            src=\"https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/08\/Dario-scaled.jpg\"\n                srcset=\"https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/08\/Dario-300x300.jpg 300w, https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/08\/Dario-1019x1024.jpg 1019w, https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/08\/Dario-150x150.jpg 150w, https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/08\/Dario-1529x1536.jpg 1529w, https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/08\/Dario-2038x2048.jpg 2038w\"\n                style=\"object-position: 50.00% 50.00%; font-family: &quot;object-fit: cover; object-position: 50.00% 50.00%;&quot;; aspect-ratio: 4\/3; object-fit: cover; width: 100%;\"\n        loading=\"lazy\"\n\/>    <\/figure><\/div><\/div><div class=\"ulux-card__body wp-block-unilux-blocks-free-content-card-item-body\">\n    \n<div class=\"card__activity wp-block-unilux-blocks-plain-text\"><\/div>\n<h3 class=\"card__name has-text-align-left wp-block-unilux-blocks-heading\"        id=\"dario-cilluffo\"\n    >\nDario Cilluffo<\/h3>\n\n<div class=\"card__organization wp-block-unilux-blocks-plain-text\">Ulm University<\/div>\n<div class=\"card__function wp-block-unilux-blocks-plain-text\">Postdoctoral Researcher<\/div>\n<div class=\"card__interest wp-block-unilux-blocks-plain-text\"><\/div><div class=\"ulux-card__link-wrapper card__link wp-block-unilux-blocks-simple-cta\">\n    <a\n        href=\"https:\/\/de.linkedin.com\/in\/dario-cilluffo-2a19a4179\"\n        title=\"Learn more\"\n        class=\"link-text link-text--icon ulux-card__link link-text link-absolute\"\n        target=\"_blank\"\n    >\n        <span class=\"link-text__body\">\n            <span class=\"link-text__name\">Learn more<\/span>\n        <\/span>\n        <svg aria-hidden=\"true\" focusable=\"false\" class=\"icon icon-outline icon--external-link \"><use xlink:href=\"https:\/\/www.uni.lu\/wp-content\/themes\/unilux-theme\/assets\/images\/icons\/icons-outline.svg#icon--external-link\"><\/use><\/svg>    <\/a>\n<\/div>\n<\/div>        <\/div>\n    <\/div>\n<\/li><\/ul><\/div><\/section>\n","protected":false},"excerpt":{"rendered":"<p>Physicists from the Universities of Luxembourg and Ulm have investigated the properties of chiral giant atoms in waveguide quantum electrodynamics<\/p>\n","protected":false},"author":51,"featured_media":26110,"template":"","format":"standard","meta":{"featured_image_focal_point":[],"show_featured_caption":false,"ulux_newsletter_groups":"","uluxPostTitle":"","uluxPrePostTitle":"","_trash_the_other_posts":false,"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false},"news-category":[8],"news-topic":[25],"organisation":[80,29],"authorship":[51],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.3 (Yoast SEO v22.3) - 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