{"id":1423,"date":"2024-05-31T16:06:31","date_gmt":"2024-05-31T07:06:31","guid":{"rendered":"https:\/\/www.phys.chs.nihon-u.ac.jp\/yamamoto\/?p=1423"},"modified":"2024-05-31T16:06:31","modified_gmt":"2024-05-31T07:06:31","slug":"6-13%e6%9c%a8%e3%81%ab%e7%ac%ac13%e5%9b%9echs%e7%89%a9%e7%90%86%e5%ad%a6%e7%a7%91%e7%a0%94%e7%a9%b6%e3%82%bb%e3%83%9f%e3%83%8a%e3%83%bc%e3%81%8c%e9%96%8b%e5%82%ac%e3%81%95%e3%82%8c%e3%81%be%e3%81%99","status":"publish","type":"post","link":"https:\/\/www.phys.chs.nihon-u.ac.jp\/yamamoto\/1423\/6-13%e6%9c%a8%e3%81%ab%e7%ac%ac13%e5%9b%9echs%e7%89%a9%e7%90%86%e5%ad%a6%e7%a7%91%e7%a0%94%e7%a9%b6%e3%82%bb%e3%83%9f%e3%83%8a%e3%83%bc%e3%81%8c%e9%96%8b%e5%82%ac%e3%81%95%e3%82%8c%e3%81%be%e3%81%99\/","title":{"rendered":"6\/13(\u6728)\u306b\u7b2c13\u56deCHS\u7269\u7406\u5b66\u79d1\u7814\u7a76\u30bb\u30df\u30ca\u30fc\u304c\u958b\u50ac\u3055\u308c\u307e\u3059"},"content":{"rendered":"\n<p>6\/13(\u6728)\u306b<a href=\"https:\/\/www.phys.chs.nihon-u.ac.jp\/research\/#ContBox04\" target=\"_blank\" rel=\"noreferrer noopener\">\u7b2c13\u56deCHS\u7269\u7406\u5b66\u79d1\u7814\u7a76\u30bb\u30df\u30ca\u30fc<\/a>\u304c\u958b\u50ac\u3055\u308c\u307e\u3059\u306e\u3067\u3001\u4e0b\u8a18\u5185\u5bb9\u306b\u3054\u8208\u5473\u3042\u308b\u65b9\u306f\u662f\u975e\u3054\u8074\u8b1b\u304f\u3060\u3055\u3044\u3002\u5b66\u5185\u306e\u65b9\u306f\u7533\u3057\u8fbc\u307f\u4e0d\u8981\u3067\u3059\u306e\u3067\u3001\u6642\u9593\u306b\u306a\u308a\u307e\u3057\u305f\u3089\u76f4\u63a5\u6307\u5b9a\u5834\u6240\u306b\u304a\u8d8a\u3057\u304f\u3060\u3055\u3044\u3002\u5b66\u5916\u304b\u3089\u3044\u3089\u3063\u3057\u3083\u308b\u65b9\u306f\u3001\u5b66\u5185\u8005\u306b\u9023\u7d61\u3092\u3068\u308b\u304b\u3001yamamoto.daisuke21[\uff71\uff6f\uff84\uff8f\uff70\uff78]nihon-u.ac.jp\u307e\u3067\u30e1\u30fc\u30eb\u3057\u3066\u3044\u305f\u3060\u3044\u305f\u4e0a\u3067\u3054\u53c2\u52a0\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<p>\u8b1b\u6f14\u8005\u3000Sidharth Rammohan \u6c0f<br>\uff08\u8fd1\u757f\u5927\u5b66\u30fb\u535a\u58eb\u7814\u7a76\u54e1\uff09<br><br>\u7b2c13\u56deCHS\u7269\u7406\u5b66\u79d1\u7814\u7a76\u30bb\u30df\u30ca\u30fc<br>\u65e5\u6642\uff1a2024\u5e746\u670813\u65e5\uff08\u6728\uff09<br>\u3000\u3000 15:00\uff5e16:30<br>\u5834\u6240\uff1a\u65e5\u672c\u5927\u5b66\u6587\u7406\u5b66\u90e8 8\u53f7\u9928 A-104, A-105 \uff08\u7269\u7406\u5b66\u79d1\u30bb\u30df\u30ca\u30fc\u5ba4\uff09<br>\u8a00\u8a9e\uff1a\u82f1\u8a9e<\/p>\n\n\n\n<p>\u30bf\u30a4\u30c8\u30eb\uff1aTailoring the Phonon Environment of Embedded Rydberg Aggregates<\/p>\n\n\n\n<p>\u6982\u8981\uff1aState-of-the-art experiments can controllably create Rydberg atoms inside a Bose- Einstein condensate (BEC) [1]. The large Rydberg electron orbital volume contains many neutral atoms, resulting in electron-atom scattering events. The number of atoms within the orbit, and hence the Rydberg-BEC interaction, can be tuned by choice of principal quantum number or condensate density [1]. This makes the hybrid system a fascinating platform for quantum simulation. We studied the physics of the interaction and corresponding dynamics of single or multiple Rydberg atoms in two internal electronic states embedded inside a BEC, to assess their utility for controlled studies of decoherence and quantum simulations of excitation transport similar to photosynthetic light-harvesting.<\/p>\n\n\n\n<p>We initially developed a theoretical framework to calculate the open quantum system input parameters like the bath correlation function and the spectral density, initially for a single Rydberg atom, possibly in two internal states with angular momentum quantum numbers l = 0 (|<em>s<\/em>\u27e9) and l = 1 (|<em>p<\/em>\u27e9) [2], in BEC and then for a chain of Rydberg atoms, forming an aggregate. The electron-atom contact interactions lead to Rydberg-BEC coupling, which creates Bogoliubov excitations (phonons) in the BEC.<\/p>\n\n\n\n<p>Using this spin-boson model with the calculated parameters, we examine the decoherence dynamics of a Rydberg atom in a superposition of |<em>s<\/em>\u27e9 and |<em>p<\/em>\u27e9 states,&nbsp; resulting from the interaction with its condensate environment. Further, we investigated the emergence of the non-Markovian features in the system in the presence of a microwave external drive of the Rydberg atom using a stochastic computational technique for non-Markovian open quantum systems [3].<\/p>\n\n\n\n<p>Finally, we extend this to the aggregate case, where one of the atoms in the aggregate is in the state |<em>p<\/em>\u27e9, while the rest are in the state |<em>s<\/em>\u27e9, resulting in excitation transport via&nbsp; dipole-dipole interaction [4]. We investigate the effects of non-Markovinity and decoherence on the excitation transport based on an effective model described by a Holstein Hamiltonian, allowing us to set up the dynamics similar to those found in light- harvesting complexes, but at a different time and energy scales.<\/p>\n\n\n\n<p>References:<br>&nbsp;1. J. B. Balewski,&nbsp;<em>et. al.<\/em>, ; Nature 502 664 (2013).<br>&nbsp;2. S. Rammohan,&nbsp;<em>et. al.<\/em>,; Phys. Rev. A 103, 063307 (2021).<br>&nbsp;3. S. Rammohan,&nbsp;<em>et. al.<\/em>,; Phys. Rev. A 104, L060202 (2021).<br>&nbsp;4. D. W. Sch\u00f6nleber,&nbsp;<em>et. al.<\/em>,; Phys. Rev. Lett. 114 123005 (2015).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>6\/13(\u6728)\u306b\u7b2c13\u56deCHS\u7269\u7406\u5b66\u79d1\u7814\u7a76\u30bb\u30df\u30ca\u30fc\u304c\u958b\u50ac\u3055\u308c\u307e\u3059\u306e\u3067\u3001\u4e0b\u8a18\u5185\u5bb9\u306b\u3054\u8208\u5473\u3042\u308b\u65b9\u306f\u662f\u975e\u3054\u8074\u8b1b\u304f\u3060\u3055\u3044\u3002\u5b66\u5185\u306e\u65b9\u306f\u7533\u3057\u8fbc\u307f\u4e0d\u8981\u3067\u3059\u306e\u3067\u3001\u6642\u9593\u306b\u306a\u308a\u307e\u3057\u305f\u3089\u76f4\u63a5\u6307\u5b9a\u5834\u6240\u306b\u304a\u8d8a\u3057\u304f\u3060\u3055\u3044\u3002\u5b66\u5916\u304b\u3089\u3044\u3089\u3063\u3057\u3083\u308b\u65b9\u306f\u3001 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","footnotes":""},"categories":[5,3],"tags":[],"class_list":["post-1423","post","type-post","status-publish","format-standard","hentry","category-news","category-whats-new"],"_links":{"self":[{"href":"https:\/\/www.phys.chs.nihon-u.ac.jp\/yamamoto\/wp-json\/wp\/v2\/posts\/1423","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.phys.chs.nihon-u.ac.jp\/yamamoto\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.phys.chs.nihon-u.ac.jp\/yamamoto\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.phys.chs.nihon-u.ac.jp\/yamamoto\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.phys.chs.nihon-u.ac.jp\/yamamoto\/wp-json\/wp\/v2\/comments?post=1423"}],"version-history":[{"count":1,"href":"https:\/\/www.phys.chs.nihon-u.ac.jp\/yamamoto\/wp-json\/wp\/v2\/posts\/1423\/revisions"}],"predecessor-version":[{"id":1427,"href":"https:\/\/www.phys.chs.nihon-u.ac.jp\/yamamoto\/wp-json\/wp\/v2\/posts\/1423\/revisions\/1427"}],"wp:attachment":[{"href":"https:\/\/www.phys.chs.nihon-u.ac.jp\/yamamoto\/wp-json\/wp\/v2\/media?parent=1423"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.phys.chs.nihon-u.ac.jp\/yamamoto\/wp-json\/wp\/v2\/categories?post=1423"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.phys.chs.nihon-u.ac.jp\/yamamoto\/wp-json\/wp\/v2\/tags?post=1423"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}