气候变化领域集成服务门户(CCPortal): Coherent optical clock down-conversion for microwave frequencies with 10−18 instability

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DOI	10.1126/science.abb2473
	Coherent optical clock down-conversion for microwave frequencies with 10−18 instability
	Nakamura T.; Davila-Rodriguez J.; Leopardi H.; Sherman J.A.; Fortier T.M.; Xie X.; Campbell J.C.; McGrew W.F.; Zhang X.; Hassan Y.S.; Nicolodi D.; Beloy K.; Ludlow A.D.; Diddams S.A.; Quinlan F.
发表日期	2020
ISSN	0036-8075
起始页码	889
结束页码	892
卷号	368 期号:6493
英文摘要	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. Copyright © 2020 The Authors,
关键词	accuracy assessment electronic equipment microwave radiation performance assessment article microwave radiation reproduction
语种	英语
来源机构	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133489
推荐引用方式 GB/T 7714	Nakamura T.,Davila-Rodriguez J.,Leopardi H.,et al. Coherent optical clock down-conversion for microwave frequencies with 10−18 instability[J]. Science,2020,368(6493).
APA	Nakamura T..,Davila-Rodriguez J..,Leopardi H..,Sherman J.A..,Fortier T.M..,...&Quinlan F..(2020).Coherent optical clock down-conversion for microwave frequencies with 10−18 instability.,368(6493).
MLA	Nakamura T.,et al."Coherent optical clock down-conversion for microwave frequencies with 10−18 instability".368.6493(2020).