Quantum interference in two-photon frequency-comb spectroscopy
Quantum interference in two-photon frequency-comb spectroscopy
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DOI：
10.1103/physreva.90.012512
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发表时间：
2014-07
影响因子：
2.9
通讯作者：
D. Yost;A. Matveev;Elisabeth Peters;A. Beyer;T. Hänsch;T. Udem
中科院分区：
文献类型：
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作者：
D. Yost;A. Matveev;Elisabeth Peters;A. Beyer;T. Hänsch;T. Udem
自发辐射或交叉阻尼引起的量子干涉是精密光谱实验中的一个重要但经常被忽视的系统，其目的是确定具有小于自然线宽的不确定性的跃迁频率。在这里，我们计算的影响，这种干扰在双光子频率梳光谱使用微扰的方法和密度矩阵方程的集成。然后，我们将这些技术应用于双光子光谱的氢$1S\ensuremath{-}3S$过渡目前正在进行我们的小组。根据检测的几何形状，我们发现扭曲的线形，这可能会导致$\ensuremath{\sim}$1 kHz的系统误差，如果在数据分析中忽略这种干扰的影响。该结果与是否使用连续激光器或频率梳用于激发无关。最后，我们提出了一个时间相关的检测方案，当与频率梳激励结合使用时，可以减轻这种干扰所产生的线失真。
Quantum interference arising from spontaneous emission, or cross-damping, is an important yet frequently overlooked systematic in precision spectroscopy experiments which aim to determine a transition frequency with an uncertainty smaller than the natural linewidth. Here, we calculate the effects of such interference in two-photon frequency-comb spectroscopy using a perturbative approach and by integration of the density matrix equations. We then apply these techniques to the two-photon spectroscopy of the hydrogen $1S\ensuremath{-}3S$ transition currently being performed in our group. Depending on the detection geometry, we find distortions of the line shapes which can lead to systematic errors of $\ensuremath{\sim}$1 kHz if such interference effects are ignored in the data analysis. This result is independent of whether a cw laser or frequency comb is used for the excitation. Finally, we propose a time-dependent detection scheme which, when used in conjunction with frequency-comb excitation, can mitigate the line distortions arising from such interference.