Aeppli Alexander, Kim Kyungtae, Warfield William, Safronova Marianna S, Ye Jun
<a href="https://ror.org/008hybe55">JILA</a>, National Institute of Standards and Technology and the University of Colorado, Boulder, Colorado 80309-0440, USA and Department of Physics, <a href="https://ror.org/02ttsq026">University of Colorado</a>, Boulder, Colorado 80309-0390, USA.
Department of Physics and Astronomy, <a href="https://ror.org/01sbq1a82">University of Delaware</a>, Newark, Delaware 19716, USA.
Phys Rev Lett. 2024 Jul 12;133(2):023401. doi: 10.1103/PhysRevLett.133.023401.
We report an optical lattice clock with a total systematic uncertainty of 8.1×10^{-19} in fractional frequency units, representing the lowest uncertainty of any clock to date. The clock relies on interrogating the ultranarrow ^{1}S_{0}→^{3}P_{0} transition in a dilute ensemble of fermionic strontium atoms trapped in a vertically-oriented, shallow, one-dimensional optical lattice. Using imaging spectroscopy, we previously demonstrated record high atomic coherence time and measurement precision enabled by precise control of collisional shifts and the lattice light shift. In this work, we revise the black body radiation shift correction by evaluating the 5s4d ^{3}D_{1} lifetime, necessitating precise characterization and control of many body effects in the 5s4d ^{3}D_{1} decay. Last, we measure the second order Zeeman coefficient on the least magnetically sensitive clock transition. All other systematic effects have uncertainties below 1×10^{-19}.
我们报道了一种光晶格钟，其分数频率单位下的总系统不确定度为8.1×10⁻¹⁹，是迄今为止所有时钟中不确定度最低的。该时钟依赖于对捕获在垂直取向、浅的一维光晶格中的费米子锶原子稀薄系综中极窄的¹S₀→³P₀跃迁进行探测。利用成像光谱技术，我们之前展示了通过精确控制碰撞频移和晶格光频移实现的创纪录的高原子相干时间和测量精度。在这项工作中，我们通过评估5s4d³D₁寿命来修正黑体辐射频移校正，这需要对5s4d³D₁衰变中的多体效应进行精确表征和控制。最后，我们测量了对磁场最不敏感的时钟跃迁上的二阶塞曼系数。所有其他系统效应的不确定度均低于1×10⁻¹⁹。
