期刊
METROLOGIA
卷 56, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1681-7575/ab3a82
关键词
optical clocks; SI second; units; time and frequency; secondary reprentations of the second
资金
- Agence Nationale de la Recherche [ANR-16-CE30-0003-01]
- Agence Nationale de la Recherche (ANR) [ANR-16-CE30-0003] Funding Source: Agence Nationale de la Recherche (ANR)
The current SI second based on the atomic hyperfine transition in the ground state of Cs-1(33) is expected to be replaced by a new definition based on optical frequency standards, whose estimated uncertainty has now been established two orders of magnitude lower than the accuracy of the best Cs primary standards. However, such a redefinition of the second is hindered by the fact that many atomic species are potential contenders to become the new primary frequency standard. In this paper, we propose to resolve this issue by defining a composite frequency unit based on the weighted geometric mean of the individual frequencies of different atomic transitions. This unit has the property to be realisable with any single clock whose transition composes the unit, provided that at least a few frequency ratios are available, with an accuracy that marginally differs from the nominal clock uncertainty. We show that the unit can be updated as the performances of the contributing transitions evolve, without incurring a drift on the unit itself.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据