A clock network for geodesy and fundamental science.
A clock network for geodesy and fundamental science.
复制标题
DOI：
10.1038/ncomms12443
复制
发表时间：
2016-08-09
影响因子：
16.6
通讯作者：
Pottie PE
中科院分区：
文献类型：
--
作者：
Lisdat C;Grosche G;Quintin N;Shi C;Raupach SM;Grebing C;Nicolodi D;Stefani F;Al-Masoudi A;Dörscher S;Häfner S;Robyr JL;Chiodo N;Bilicki S;Bookjans E;Koczwara A;Koke S;Kuhl A;Wiotte F;Meynadier F;Camisard E;Abgrall M;Lours M;Legero T;Schnatz H;Sterr U;Denker H;Chardonnet C;Le Coq Y;Santarelli G;Amy-Klein A;Le Targat R;Lodewyck J;Lopez O;Pottie PE
利用光学时钟无与伦比的性能作为地球科学，天文学和基础物理学的关键工具，超越标准模型，需要忠实地比较遥远的光学时钟的频率。在这里，我们报告的比较和协议的两个锶光学时钟的不确定性为5 × 10−17通过一个新建立的相位相干频率链路连接巴黎和布伦瑞克使用1,415公里的电信光纤。远程比较仅受锶晶格时钟本身的不稳定性和不确定性的限制，来自光学频率转移的贡献可以忽略不计。平均时间仅为1,000 s，小数精度就达到了3 × 10−17，这比以前任何长距离时钟比较都要快10倍，快4个数量级以上。执行高分辨率国际时钟比较的能力为重新定义时间单位和SI秒的全光学传播铺平了道路。 比较两个遥远的光学钟的频率将使基础物理学的灵敏测试成为可能。在这里，作者比较了两个相距690公里的锶光学晶格时钟，其精确度仅受单个时钟本身的不确定性的限制。
Leveraging the unrivalled performance of optical clocks as key tools for geo-science, for astronomy and for fundamental physics beyond the standard model requires comparing the frequency of distant optical clocks faithfully. Here, we report on the comparison and agreement of two strontium optical clocks at an uncertainty of 5 × 10−17 via a newly established phase-coherent frequency link connecting Paris and Braunschweig using 1,415 km of telecom fibre. The remote comparison is limited only by the instability and uncertainty of the strontium lattice clocks themselves, with negligible contributions from the optical frequency transfer. A fractional precision of 3 × 10−17 is reached after only 1,000 s averaging time, which is already 10 times better and more than four orders of magnitude faster than any previous long-distance clock comparison. The capability of performing high resolution international clock comparisons paves the way for a redefinition of the unit of time and an all-optical dissemination of the SI-second. Comparing the frequency of two distant optical clocks will enable sensitive tests of fundamental physics. Here, the authors compare two strontium optical-lattice clocks 690 kilometres apart to a degree of accuracy that is limited only by the uncertainty of the individual clocks themselves.