论文标题
$ 1 \ times 10^{ - 17} $不确定性和其绝对频率的测量
A strontium optical lattice clock with $1 \times 10^{-17}$ uncertainty and measurement of its absolute frequency
论文作者
论文摘要
我们提出了5S $^2 $ $^1 $ s $ s $ _0 $ to 5s5p $^3 $^3 $ p $ _0 $ _0 $ _0 $ p $ _0 $的绝对频率的测量值，这是Si second的次要表示。我们描述了用于测量的光学晶格时钟设备，并详细介绍了如何评估其系统的频移，总体不确定性为$ 1 \ times 10^{ - 17} $。通过与国际原子时间（TAI）进行比较，提供了国际单位体系的可追溯性。在5天和15天的时间内收集数据，晶格时钟平均运行74 $ \％$，我们测量过渡的频率为429228004229873.1（5）Hz，这对应于$ 1 \ times 10^{ - 15} $的分数不确定性。我们详细描述了这种不确定性是如何从将光学频率标准（通过我们的本地时间尺度UTC（NPL））连接到引导tai的主要和次要频率标准的集合的中间步骤引起的。计算出的过渡的绝对频率与在世界其他实验室进行的最新测量非常吻合。
We present a measurement of the absolute frequency of the 5s$^2$ $^1$S$_0$ to 5s5p $^3$P$_0$ transition in $^{87}$Sr, which is a secondary representation of the SI second. We describe the optical lattice clock apparatus used for the measurement, and we focus in detail on how its systematic frequency shifts are evaluated with a total fractional uncertainty of $1 \times 10^{-17}$. Traceability to the International System of Units is provided via comparison to International Atomic Time (TAI). Gathering data over 5- and 15-day periods, with the lattice clock operating on average 74$\%$ of the time, we measure the frequency of the transition to be 429228004229873.1(5) Hz, which corresponds to a fractional uncertainty of $1 \times 10^{-15}$. We describe in detail how this uncertainty arises from the intermediate steps linking the optical frequency standard, through our local time scale UTC(NPL), to an ensemble of primary and secondary frequency standards which steer TAI. The calculated absolute frequency of the transition is in good agreement with recent measurements carried out in other laboratories around the world.
