Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1126/science.abb2473 |
Coherent optical clock down-conversion for microwave frequencies with 10−18 instability | |
Takuma Nakamura; Josue Davila-Rodriguez; Holly Leopardi; Jeff A. Sherman; Tara M. Fortier; Xiaojun Xie; Joe C. Campbell; William F. McGrew; Xiaogang Zhang; Youssef S. Hassan; Daniele Nicolodi; Kyle Beloy; Andrew D. Ludlow; Scott A. Diddams; Franklyn Quinlan | |
2020-05-22 | |
发表期刊 | Science
![]() |
出版年 | 2020 |
英文摘要 | Timing standards around the world define the second using atomic clocks, specifically the microwave frequencies emitted from trapped atoms. Optical clocks, which are based on optical transitions of atoms, operate at much higher frequency and have been shown to exhibit better stability. Nakamura et al. demonstrate a framework that carries the improved stability of the optical domain over to microwaves (see the Perspective by Curtis). In addition to contributing to the eventual redefinition of the second based on optical clocks, this work will also lead to improvements in microwave-based technologies such as astronomical imaging and geodesy through very long baseline interferometry, radar, communications, and navigation systems. Science , this issue p. [889][1]; see also p. [825][2] Optical atomic clocks are poised to redefine the Système International (SI) second, thanks to stability and accuracy more than 100 times better than the current microwave atomic clock standard. However, the best optical clocks have not seen their performance transferred to the electronic domain, where radar, navigation, communications, and fundamental research rely on less stable microwave sources. By comparing two independent optical-to-electronic signal generators, we demonstrate a 10-gigahertz microwave signal with phase that exactly tracks that of the optical clock phase from which it is derived, yielding an absolute fractional frequency instability of 1 × 10−18 in the electronic domain. Such faithful reproduction of the optical clock phase expands the opportunities for optical clocks both technologically and scientifically for time dissemination, navigation, and long-baseline interferometric imaging. [1]: /lookup/doi/10.1126/science.abb2473 [2]: /lookup/doi/10.1126/science.abb8629 |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/270500 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Takuma Nakamura,Josue Davila-Rodriguez,Holly Leopardi,et al. Coherent optical clock down-conversion for microwave frequencies with 10−18 instability[J]. Science,2020. |
APA | Takuma Nakamura.,Josue Davila-Rodriguez.,Holly Leopardi.,Jeff A. Sherman.,Tara M. Fortier.,...&Franklyn Quinlan.(2020).Coherent optical clock down-conversion for microwave frequencies with 10−18 instability.Science. |
MLA | Takuma Nakamura,et al."Coherent optical clock down-conversion for microwave frequencies with 10−18 instability".Science (2020). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论