{"id":1614,"date":"2025-07-04T14:22:32","date_gmt":"2025-07-04T05:22:32","guid":{"rendered":"https:\/\/kosaka-lab.ynu.ac.jp\/en\/?p=1614"},"modified":"2025-11-12T13:42:24","modified_gmt":"2025-11-12T04:42:24","slug":"20250704","status":"publish","type":"post","link":"https:\/\/kosaka-lab.ynu.ac.jp\/en\/news2025\/20250704\/","title":{"rendered":"New Paper Published: Quantum Orbital\u2011State Control of a Neutral Nitrogen\u2011Vacancy Center at Millikelvin Temperatures"},"content":{"rendered":"<p>A team led by Hodaka Kurokawa, Hideo Kosaka, and their co-authors at Yokohama National University, AIST, and QST has demonstrated a new method for controlling the orbital states of a neutral NV center in diamond at millikelvin temperatures. These results have been published in Physical Review Letters.<\/p>\n<p>Key findings include:<br \/>\n\u30fbA tenfold increase in the orbital relaxation time of a neutral NV center by cooling from 5\u202fK to 15\u202fmK<br \/>\n\u30fbUse of dynamical decoupling pulses to boost orbital coherence time to over 1.6\u202fmicroseconds, a 30-fold improvement<\/p>\n<p>The neutral NV center is a promising platform for microwave-optical quantum interfaces due to its high sensitivity to electric fields and its ground state splitting around 10 GHz. We have demonstrated that the orbital lifetime and coherence can be enhanced up to 5 microseconds and 1.6 microseconds, respectively, which is more than a 10-fold increase. These results open up the possibility of microwave-optical quantum electrodynamics using a single optically active defect center in diamond.<\/p>\n<div style=\"border-left: 4px solid #004080; padding: 12px 20px; background-color: #f9f9f9; margin-bottom: 20px;\"><strong>Paper Information:<\/strong><br \/>\nQuantum Orbital-State Control of a Neutral Nitrogen-Vacancy Center at Millikelvin Temperatures<br \/>\nHodaka Kurokawa, Shintaro Nakazato, Toshiharu Makino, Hiromitsu Kato, Shinobu Onoda, Yuhei Sekiguchi, and Hideo Kosaka<br \/>\n<i>Physical Review Letters<\/i><strong> 135<\/strong>, 016902 (2025)<\/div>\n<p><a style=\"display: inline-block; padding: 10px 20px; background-color: #004080; color: #ffffff; text-decoration: none; border-radius: 4px; font-weight: bold;\" href=\"https:\/\/journals.aps.org\/prl\/abstract\/10.1103\/m1qx-xlpd\" target=\"_blank\" rel=\"noopener\">Read the full paper<\/a><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-1629\" src=\"https:\/\/kosaka-lab.ynu.ac.jp\/en\/wp-content\/uploads\/2025\/07\/summary_fig_01.png\" alt=\"\" width=\"475\" height=\"433\" srcset=\"https:\/\/kosaka-lab.ynu.ac.jp\/en\/wp-content\/uploads\/2025\/07\/summary_fig_01.png 475w, https:\/\/kosaka-lab.ynu.ac.jp\/en\/wp-content\/uploads\/2025\/07\/summary_fig_01-300x273.png 300w\" sizes=\"(max-width: 475px) 100vw, 475px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A team led by Hodaka Kurokawa, Hideo Kosaka, and their co-authors at Yokohama National University, AIST, and QST has demonstrated a new method for controlling the orbital states of a neutral NV center in diamond at millikelvin temperatures. These results have been published in Physical Review Letters. Key findings include: \u30fbA tenfold increase in the orbital relaxation time of a neutral NV center by cooling from 5\u202fK to 15\u202fmK \u30fbUse of dynamical decoupling pulses to boost orbital coherence time to over 1.6\u202fmicroseconds, a 30-fold improvement The neutral NV center is a promising platform for microwave-optical quantum interfaces due to its high sensitivity to electric fields and its ground state splitting [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1629,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[33],"tags":[],"news_cat":[42],"class_list":["post-1614","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news2025","news_cat-papers"],"_links":{"self":[{"href":"https:\/\/kosaka-lab.ynu.ac.jp\/en\/wp-json\/wp\/v2\/posts\/1614","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kosaka-lab.ynu.ac.jp\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kosaka-lab.ynu.ac.jp\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kosaka-lab.ynu.ac.jp\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kosaka-lab.ynu.ac.jp\/en\/wp-json\/wp\/v2\/comments?post=1614"}],"version-history":[{"count":14,"href":"https:\/\/kosaka-lab.ynu.ac.jp\/en\/wp-json\/wp\/v2\/posts\/1614\/revisions"}],"predecessor-version":[{"id":1835,"href":"https:\/\/kosaka-lab.ynu.ac.jp\/en\/wp-json\/wp\/v2\/posts\/1614\/revisions\/1835"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kosaka-lab.ynu.ac.jp\/en\/wp-json\/wp\/v2\/media\/1629"}],"wp:attachment":[{"href":"https:\/\/kosaka-lab.ynu.ac.jp\/en\/wp-json\/wp\/v2\/media?parent=1614"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kosaka-lab.ynu.ac.jp\/en\/wp-json\/wp\/v2\/categories?post=1614"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kosaka-lab.ynu.ac.jp\/en\/wp-json\/wp\/v2\/tags?post=1614"},{"taxonomy":"news_cat","embeddable":true,"href":"https:\/\/kosaka-lab.ynu.ac.jp\/en\/wp-json\/wp\/v2\/news_cat?post=1614"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}