发表机构
National Institute of Standards and Technology; University of Colorado Boulder; Infleqtion; HRL Laboratories; DARPA（美国国家标准与技术研究院; 科罗拉多大学博尔德分校; 英飞格蒂昂; HRL实验室; 美国国防部高级研究计划局）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文研制了基于微加工Cs原子束器件的厘米级Ramsey CPT钟，利用原子束光谱特征控制光移，实现了高稳定度与低漂移，拓展了低功耗计时应用的钟稳定度范围。
AI 中文摘要
芯片级原子束钟正被研究以拓展低功耗计时应用中可实现的钟稳定度范围。本文展示了一种基于微加工铯（Cs）原子束器件的厘米级Ramsey相干布居囚禁（CPT）钟，并研究决定其主要钟系统误差的光移与多普勒移之间的相互作用。我们表明，这些移项对CPT光参数呈现相互竞争的依赖关系，从而形成“双重不敏感”工作点，此时钟频率同时对激光频率和功率不敏感。我们进一步展示了一种利用原子束的光谱特征控制关键钟移的方法，该方法与完全集成操作兼容。该钟在1秒时实现了2×10⁻¹⁰的分数频率稳定度，在近17小时内的漂移低于亚微秒，且主要CPT光系统误差被控制在10⁻¹²水平以下。
英文摘要
Chip-scale atomic beam clocks are being investigated to extend the range of clock stability achievable in low-power timing applications. Here, we demonstrate a centimeter-scale, Ramsey coherent population trapping (CPT) clock based on a microfabricated Cs atomic beam device and investigate the interplay between light shifts and Doppler shifts that determines its leading clock systematics. We show that these shifts exhibit competing dependencies on CPT light parameters, leading to ``doubly-insensitive" operating points where the clock frequency is simultaneously insensitive to laser frequency and power. We further demonstrate a method for controlling key clock shifts using spectroscopic signatures from the atomic beam that is compatible with fully-integrated operation. The clock achieves a fractional frequency stability of $2 \times 10^{-10}$ at $1~\textrm{s}$ and sub-$μ$s drift over nearly $17~\textrm{hours}$, with leading CPT light systematics controlled below the $10^{-12}$ level.
Comments10 pages, 6 figures
