对总不确定度为2×10⁻¹⁸的原子钟进行系统评估。
Systematic evaluation of an atomic clock at 2 × 10(-18) total uncertainty.
作者信息
Nicholson T L, Campbell S L, Hutson R B, Marti G E, Bloom B J, McNally R L, Zhang W, Barrett M D, Safronova M S, Strouse G F, Tew W L, Ye J
机构信息
JILA, National Institute of Standards and Technology and University of Colorado, Boulder, Colorado 80309-0440, USA.
Department of Physics, University of Colorado, Boulder, Colorado 80309-0390, USA.
出版信息
Nat Commun. 2015 Apr 21;6:6896. doi: 10.1038/ncomms7896.
The pursuit of better atomic clocks has advanced many research areas, providing better quantum state control, new insights in quantum science, tighter limits on fundamental constant variation and improved tests of relativity. The record for the best stability and accuracy is currently held by optical lattice clocks. Here we take an important step towards realizing the full potential of a many-particle clock with a state-of-the-art stable laser. Our (87)Sr optical lattice clock now achieves fractional stability of 2.2 × 10(-16) at 1 s. With this improved stability, we perform a new accuracy evaluation of our clock, reducing many systematic uncertainties that limited our previous measurements, such as those in the lattice ac Stark shift, the atoms' thermal environment and the atomic response to room-temperature blackbody radiation. Our combined measurements have reduced the total uncertainty of the JILA Sr clock to 2.1 × 10(-18) in fractional frequency units.
对更精密原子钟的追求推动了许多研究领域的发展，实现了更好的量子态控制、带来了量子科学的新见解、对基本常数变化的限制更严格，并改进了相对论测试。目前，光晶格钟在稳定性和准确性方面保持着最佳记录。在此，我们利用一台最先进的稳定激光器，朝着充分发挥多粒子钟的潜力迈出了重要一步。我们的（87）锶光晶格钟目前在1秒时的分数稳定性达到了2.2×10^(-16)。凭借这种提高的稳定性，我们对时钟进行了新的精度评估，减少了许多限制我们先前测量的系统不确定性，比如晶格交流斯塔克位移、原子的热环境以及原子对室温黑体辐射的响应等方面的不确定性。我们的综合测量已将JILA锶钟在分数频率单位下的总不确定度降低至2.1×10^(-18)。
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