Atomic frequency comb (AFC) quantum memory is a favorable protocol in long distance quantum communication. Putting the AFC inside an asymmetric optical cavity enhances the storage efficiency but makes the measurement of the comb properties challenging. We develop a theoretical model for cavity-enhanced AFC quantum memory that includes the effects of dispersion, and show a close alignment of the model with our own experimental results. Providing semi-quantitative agreement for estimating the efficiency and a good description of how the efficiency changes as a function of detuning, it also captures certain qualitative features of the experimental reflectivity. For comparison, we show that a theoretical model without dispersion fails dramatically to predict the correct efficiencies. Our model is a step forward to accurately estimating the created comb properties, such as the optical depth inside the cavity, and so being able to make precise predictions of the performance of the prepared cavity-enhanced AFC quantum memory.

中文翻译：

---

建立腔增强原子频率梳量子存储器的现实模型


原子频率梳（AFC）量子存储器是长距离量子通信中有利的协议。将 AFC 放入非对称光学腔内可以提高存储效率，但使梳状特性的测量变得具有挑战性。我们开发了一个包含色散效应的腔增强 AFC 量子存储器的理论模型，并展示了该模型与我们自己的实验结果的紧密结合。它为估计效率提供了半定量一致性，并很好地描述了效率如何随失谐函数变化，它还捕获了实验反射率的某些定性特征。为了进行比较，我们表明没有色散的理论模型明显无法预测正确的效率。我们的模型在准确估计所创建的梳状特性（例如腔内的光学深度）方面向前迈出了一步，因此能够精确预测所制备的腔增强型 AFC 量子存储器的性能。