Article(id=1207621138000220950, tenantId=1146029695717560320, journalId=1146031591421210625, issueId=1207621133784948800, articleNumber=null, orderNo=3, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=null, receivedDateStr=null, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1765848915815, onlineDateStr=2025-12-16, pubDate=1751040000000, pubDateStr=2025-06-28, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1751472000000, onlineIssueDateStr=2025-07-03, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1765848915815, creator=13701087609, updateTime=1774079728187, updator=sys-migrate, issue=Issue{id=1207621133784948800, tenantId=1146029695717560320, journalId=1146031591421210625, year='2025', volume='43', issue='12', pageStart='1', pageEnd='188', issueExtLink='null', onlineDate='null', pubDate='1751040000000', pubDateStr='2025-06-28', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1765848914810, creator='13701087609', updateTime=1774330924420, updator='13041195026', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1243197260683657459, tenantId=1146029695717560320, journalId=1146031591421210625, issueId=1207621133784948800, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1243197260683657460, tenantId=1146029695717560320, journalId=1146031591421210625, issueId=1207621133784948800, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=2, endPage=7, ext={EN=ArticleExt(id=1207621138365125412, articleId=1207621138000220950, tenantId=1146029695717560320, journalId=1146031591421210625, language=EN, title=null, columnId=null, journalTitle=Science & Technology Review, columnName=null, runingTitle=null, highlight=null, articleAbstract=

跨越2000 km还能把时差掐在几皮秒？这曾被不少计量专家视作“地面链路的天花板”。中国科学院国家授时中心张首刚、董瑞芳和刘涛团队用1根公共通信光纤、2束相邻波长的光脉冲，将这一极限再向前推进一大步——在2061 km现场链路上，把1 s稳定度做到了5.6 ps，授时误差再缩小数十个百分点。

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跨越2000 km还能把时差掐在几皮秒？这曾被不少计量专家视作“地面链路的天花板”。中国科学院国家授时中心张首刚、董瑞芳和刘涛团队用1根公共通信光纤、2束相邻波长的光脉冲，将这一极限再向前推进一大步——在2061 km现场链路上，把1 s稳定度做到了5.6 ps，授时误差再缩小数十个百分点。

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（图片来源：《Chinese Optics Letters》）

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