{"id":442238,"date":"2024-01-26T14:40:01","date_gmt":"2024-01-26T13:40:01","guid":{"rendered":"https:\/\/www.eenewseurope.com\/?p=442238"},"modified":"2024-01-26T14:40:01","modified_gmt":"2024-01-26T13:40:01","slug":"supraconductivite-a-temperature-ambiante-demontree-dans-le-graphite","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/supraconductivite-a-temperature-ambiante-demontree-dans-le-graphite\/","title":{"rendered":"Supraconductivit\u00e9 \u00e0 temp\u00e9rature ambiante d\u00e9montr\u00e9e dans le graphite"},"content":{"rendered":"<h3>Des chercheurs suisses affirment avoir observ\u00e9 pour la premi\u00e8re fois une supraconductivit\u00e9 \u00e0 temp\u00e9rature ambiante dans du graphite, ce qui ouvre des perspectives en mati\u00e8re d&rsquo;informatique quantique.<\/h3>\n<p>Cette recherche, publi\u00e9e dans Advanced Quantum Technologies, fait \u00e9tat de la toute premi\u00e8re observation de la supraconductivit\u00e9 \u00e0 temp\u00e9rature ambiante (300 K) et \u00e0 pression normale \u00e0 l&rsquo;aide de graphite pyrolytique en vrac.<\/p>\n<p>La recherche a \u00e9t\u00e9 men\u00e9e par le professeur Valerii Vinokur, directeur de la technologie chez Terra Quantum en Suisse, avec le professeur Yakov Kopelevich et des coauteurs de l&rsquo;Universidade Estadual de Campinas, de l&rsquo;universit\u00e9 de P\u00e9rouse et de SwissScientific Technologies.<\/p>\n<p>Terra Quantum a brevet\u00e9 cette approche qui, selon Vinokur, pourrait \u00eatre 100 fois plus efficace que les qubits supraconducteurs existants. Avant de rejoindre Terra Quantum en 2019, M. Vinokur a \u00e9t\u00e9 scientifique principal au laboratoire national d&rsquo;Argonne du minist\u00e8re am\u00e9ricain de l&rsquo;\u00e9nergie pendant 30 ans.<\/p>\n<p>\u00ab\u00a0Notre travail est une d\u00e9couverte exp\u00e9rimentale que l&rsquo;humanit\u00e9 attendait depuis une centaine d&rsquo;ann\u00e9es, depuis la premi\u00e8re observation de la supraconductivit\u00e9 dans le mercure\u00a0\u00bb, a d\u00e9clar\u00e9 M. Vinokur.<\/p>\n<p>Le graphite pyrolytique est une forme manufactur\u00e9e de graphite. Des chercheurs de l&rsquo;Universidade Estadual de Campinas, dirig\u00e9s par Kopelevich, ont utilis\u00e9 du scotch pour d\u00e9couper ce graphite en fines feuilles. Ces feuilles \u00e9taient couvertes de r\u00e9seaux denses de rides en lignes presque parall\u00e8les. La g\u00e9om\u00e9trie de ces rides permet aux \u00e9lectrons de s&rsquo;apparier dans des structures qui permettent aux courants supraconducteurs de circuler le long des rides.<\/p>\n<p>\u00ab\u00a0Cette d\u00e9couverte faite par notre \u00e9quipe scientifique et nos partenaires universitaires et industriels ouvre la voie \u00e0 des avanc\u00e9es spectaculaires dans le domaine de la technologie supraconductrice. La supraconductivit\u00e9 \u00e0 temp\u00e9rature ambiante ouvre la voie \u00e0 des avanc\u00e9es transformatrices dans tous les secteurs\u00a0\u00bb, a d\u00e9clar\u00e9 Markus Pflitsch, fondateur et PDG de Terra Quantum.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.eenewseurope.com\/en\/lab-grows-high-temperature-superconductor-on-silicon\/\">Un laboratoire fait cro\u00eetre un supraconducteur \u00e0 haute temp\u00e9rature sur du silicium<\/a><\/li>\n<li><a href=\"https:\/\/www.eenewseurope.com\/en\/room-temperature-superconductor-sees-key-patent\/\">Un brevet cl\u00e9 pour un supraconducteur \u00e0 temp\u00e9rature ambiante<\/a><\/li>\n<\/ul>\n<p>\u00ab\u00a0Imaginez des r\u00e9seaux \u00e9lectriques presque sans perte d&rsquo;\u00e9nergie, r\u00e9volutionnant notre approche du transport de l&rsquo;\u00e9lectricit\u00e9. Dans le domaine de la sant\u00e9, des technologies IRM am\u00e9lior\u00e9es verront le jour, offrant une pr\u00e9cision de diagnostic sans pr\u00e9c\u00e9dent. Les transports feront un bond en avant gr\u00e2ce \u00e0 des trains \u00e0 l\u00e9vitation magn\u00e9tique \u00e0 grande vitesse et \u00e0 faible consommation d&rsquo;\u00e9nergie. L&rsquo;\u00e9lectronique entrera dans une nouvelle \u00e8re de miniaturisation et d&rsquo;efficacit\u00e9 \u00e9nerg\u00e9tique\u00a0\u00bb, a-t-il d\u00e9clar\u00e9.<\/p>\n<p>\u00ab\u00a0Le domaine \u00e9mergent de l&rsquo;informatique quantique en b\u00e9n\u00e9ficiera \u00e9norm\u00e9ment puisque les qubits qui ne fonctionnent aujourd&rsquo;hui qu&rsquo;\u00e0 10-20 mK pourront fonctionner \u00e0 temp\u00e9rature ambiante\u00a0\u00bb, a ajout\u00e9 M. Vinokur.<\/p>\n<p>Cependant, plusieurs mat\u00e9riaux ont \u00e9t\u00e9 propos\u00e9s qui pr\u00e9sentent une supraconductivit\u00e9 \u00e0 temp\u00e9rature ambiante, mais celle-ci a \u00e9t\u00e9 difficile \u00e0 reproduire.<\/p>\n<p>Le m\u00e9canisme conduisant \u00e0 la supraconductivit\u00e9 le long des d\u00e9fauts unidimensionnels a \u00e9t\u00e9 expliqu\u00e9 par C. A. Trugenberger, M. C. Diamantini et V. M. Vinokur.<\/p>\n<p>Les fluctuations de contrainte \u00e0 l&rsquo;int\u00e9rieur de ces d\u00e9fauts peuvent \u00eatre d\u00e9crites par des champs de jauge topologiques effectifs, qui transmettent un potentiel attractif amenant les \u00e9lectrons des gouttelettes dans les d\u00e9fauts \u00e0 s&rsquo;apparier et \u00e0 se condenser selon le mod\u00e8le de Bose.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.eenewseurope.com\/en\/race-is-on-for-room-temperature-superconductor\/\">La course au supraconducteur \u00e0 temp\u00e9rature ambiante est lanc\u00e9e <\/a><\/li>\n<li><a href=\"https:\/\/www.eenewseurope.com\/en\/reddmatter-the-future-of-superconductivity\/\">Reddmatter &#8211; L&rsquo;avenir de la supraconductivit\u00e9<\/a><\/li>\n<\/ul>\n<p>La dimension tr\u00e8s fine de ces gouttelettes conduit \u00e0 un \u00e9tat fondamental tr\u00e8s robuste pour ces paires. Les gouttelettes de condensat forment un r\u00e9seau efficace de jonctions Josephson \u00e0 la surface du graphite, qui g\u00e8le dans son \u00e9tat topologique de m\u00e9tal de Bose, avec une conduction r\u00e9siduelle sur les bords form\u00e9s par les d\u00e9fauts.<\/p>\n<p>Sur ces d\u00e9fauts, les glissements de phase quantiques provoquent g\u00e9n\u00e9ralement une dissipation. Toutefois, en raison de la soudure dimensionnelle entre la surface bidimensionnelle et la masse tridimensionnelle, les glissements de phase quantiques ne sont que les extr\u00e9mit\u00e9s des tourbillons de la masse qui se d\u00e9placent sur la surface. En raison de la tr\u00e8s faible r\u00e9sistance de la masse, le mouvement de ces tourbillons est supprim\u00e9, de m\u00eame que la dissipation induite par les glissements de phase quantique sur les d\u00e9fauts. Ces d\u00e9fauts deviennent alors supraconducteurs.<\/p>\n<p>La recherche a \u00e9t\u00e9 soutenue par la startup suisse Terra Quantum, qui propose des \u00ab\u00a0services quantiques\u00a0\u00bb dans trois domaines cl\u00e9s, des algorithmes \u00e0 l&rsquo;informatique quantique en passant par la s\u00e9curit\u00e9 quantique.<\/p>\n<p>L&rsquo;article complet est disponible \u00e0 l&rsquo;adresse suivante : <a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/qute.202300230\">onlinelibrary.wiley.com\/doi\/10.1002\/qute.202300230<\/a>.<\/p>\n<p><a href=\"https:\/\/terraquantum.swiss\/\">terraquantum.swiss<\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Des chercheurs suisses affirment avoir observ\u00e9 pour la premi\u00e8re fois une supraconductivit\u00e9 \u00e0 temp\u00e9rature ambiante dans du graphite, ce qui ouvre des perspectives en mati\u00e8re d&rsquo;informatique quantique. Cette recherche, publi\u00e9e dans Advanced Quantum Technologies, fait \u00e9tat de la toute premi\u00e8re observation de la supraconductivit\u00e9 \u00e0 temp\u00e9rature ambiante (300 K) et \u00e0 pression normale \u00e0 l&rsquo;aide [&hellip;]<\/p>\n","protected":false},"author":34,"featured_media":442200,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[883],"tags":[913,3676,1603,5709],"domains":[47],"ppma_author":[1153,3640],"class_list":["post-442238","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologies","tag-materials-processes-fr","tag-quantique-fr","tag-quantique","tag-supraconductivite","domains-electronique-eci"],"acf":[],"yoast_head":"<title>Supraconductivit\u00e9 \u00e0 temp\u00e9rature ambiante d\u00e9montr\u00e9e dans le...<\/title>\n<meta name=\"description\" content=\"Des chercheurs suisses affirment avoir 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