{"id":2245,"date":"2026-09-25T01:11:00","date_gmt":"2026-09-24T16:11:00","guid":{"rendered":"https:\/\/onepress.co.kr\/index.php\/briefing\/2026-09-25-lutetium-clock-en\/"},"modified":"2026-09-25T01:11:00","modified_gmt":"2026-09-24T16:11:00","slug":"2026-09-25-lutetium-clock-en","status":"publish","type":"briefing","link":"https:\/\/onepress.co.kr\/index.php\/briefing\/2026-09-25-lutetium-clock-en\/","title":{"rendered":"Two lutetium clocks agreed at the 19th decimal place"},"content":{"rendered":"<p><strong>2026-09-25 01:11 KST<\/strong><\/p>\n<p>Each clock had evaluated uncertainty near 1\u00d710\u207b\u00b9\u2079, four times lower than the previous record.<\/p>\n<p>The systems were compared after 200 hours of averaging, testing whether their systematic error budgets held in practice.<\/p>\n<h2>Why lutetium<\/h2>\n<p>Its optical transition is unusually insensitive to temperature and magnetic fields. Room-temperature operation and commercial lasers may aid portability.<\/p>\n<h2>Accuracy versus stability<\/h2>\n<p>Accuracy limits systematic offset; stability describes short-term fluctuation. The advance is verifying calculated accuracy by comparing two clocks.<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/onepress.co.kr\/wp-content\/uploads\/2026\/09\/lutetium-clock-en.png\" alt=\"Two lutetium clocks agreed at the 19th decimal place\" loading=\"lazy\" \/><figcaption class=\"op-briefing-image-caption\">This AI-generated image explains the topic; it is not a photograph of an actual event, observation or field site.<\/figcaption><\/figure>\n<h2>Uses<\/h2>\n<p>Better clocks can support geodesy, navigation and tests for changing constants or dark matter. This is not a consumer timekeeping product.<\/p>\n<h2>Next<\/h2>\n<p>Other laboratories and long-distance networks must reproduce it. Redefining the SI second remains a separate international process.<\/p>\n<h2>Primary source and independent checks<\/h2>\n<p>Primary source: <a href=\"https:\/\/doi.org\/10.1038\/s41586-026-11072-8\" target=\"_blank\" rel=\"noopener noreferrer\">Nature paper<\/a><\/p>\n<p>Institutional explanation: <a href=\"https:\/\/news.nus.edu.sg\/worlds-most-accurate-atomic-clock\/\" target=\"_blank\" rel=\"noopener noreferrer\">NUS\/CQT release<\/a><\/p>\n<p>Independent check: <a href=\"https:\/\/www.nature.com\/articles\/d41586-026-03019-w\" target=\"_blank\" rel=\"noopener noreferrer\">Nature independent news<\/a><\/p>\n<h2>Read in other languages<\/h2>\n<p><a href=\"https:\/\/onepress.co.kr\/index.php\/briefing\/2026-09-25-lutetium-clock-ko\/\">\ud55c\uad6d\uc5b4<\/a> \u00b7 <a href=\"https:\/\/onepress.co.kr\/index.php\/briefing\/2026-09-25-lutetium-clock-en\/\">English<\/a> \u00b7 <a href=\"https:\/\/onepress.co.kr\/index.php\/briefing\/2026-09-25-lutetium-clock-es\/\">Espa\u00f1ol<\/a> \u00b7 <a href=\"https:\/\/onepress.co.kr\/index.php\/briefing\/2026-09-25-lutetium-clock-ja\/\">\u65e5\u672c\u8a9e<\/a> \u00b7 <a href=\"https:\/\/onepress.co.kr\/index.php\/briefing\/2026-09-25-lutetium-clock-vi\/\">Ti\u1ebfng Vi\u1ec7t<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A Singapore team built two independent lutetium-ion clocks and verified agreement at 5.7\u00d710\u207b\u00b9\u2079. \u201cOne second in 260 billion years\u201d translates uncertainty into time; the clocks were not run for that duration.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"class_list":["post-2245","briefing","type-briefing","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/briefing\/2245","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/briefing"}],"about":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/types\/briefing"}],"wp:attachment":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/media?parent=2245"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}