论文标题
使用相关光谱的两个独立$ {}^{27} \ textrm {al}^{al
Lifetime-Limited Interrogation of Two Independent ${}^{27}\textrm{Al}^{+}$ Clocks Using Correlation Spectroscopy
论文作者
论文摘要
激光的分解通过拓宽可观察到的共振线宽并在时钟探针之间的死时间内增加噪声来限制光学时钟的稳定性。相关光谱法可以通过测量两个合奏之间的相关原子过渡来避免这些局限性，从而提供了独立于激光噪声的频率差测量。在这里，我们将此技术应用于基于$^1S_0 \ leftrightArrow {}^3p_0 $ transition $^{27} $ al $^+$的两个独立时钟之间的稳定性测量。通过稳定两个时钟之间差异相位噪声的主要来源，我们在同步的拉姆西询问期间观察到它们之间的连贯性，长达8 s，频率为$ 1.12 \ times10^{15} $ hz。相关光谱信号中观察到的对比与20.6 s $^3p_0 $状态寿命一致，并支持$（1.8 \ pm0.5）\ times 10^{ - 16}/\ sqrt {τ/\ s textrm {s}} $ nibire deptime niber depration for Aderigations for Aderigations for Adee duratione dere的测量不稳定。
Laser decoherence limits the stability of optical clocks by broadening the observable resonance linewidths and adding noise during the dead time between clock probes. Correlation spectroscopy avoids these limitations by measuring correlated atomic transitions between two ensembles, which provides a frequency difference measurement independent of laser noise. Here, we apply this technique to perform stability measurements between two independent clocks based on the $^1S_0\leftrightarrow{}^3P_0$ transition in $^{27}$Al$^+$. By stabilizing the dominant sources of differential phase noise between the two clocks, we observe coherence between them during synchronous Ramsey interrogations as long as 8 s at a frequency of $1.12\times10^{15}$ Hz. The observed contrast in the correlation spectroscopy signal is consistent with the 20.6 s $^3P_0$ state lifetime and supports a measurement instability of $(1.8\pm0.5)\times 10^{-16}/\sqrt{τ/\textrm{s}}$ for averaging periods longer than the probe duration when deadtime is negligible.
