论文标题
使用$χ^{（2）} $非线性培养基在腔中检测单个原子
Detecting a single atom in a cavity using the $χ^{(2)}$ nonlinear medium
论文作者
论文摘要
我们提出了一个协议，用于借助$χ^{（2）} $ nonlinear介质在腔中检测单个原子。当$χ^{（2）} $非线性培养基由外部激光场驱动时，腔模式将被挤压，因此可以获得指数增强的光 - 耦合。原子和腔场之间的强烈耦合可以显着改变输出光子通量，量子波动，量子统计特性和腔场的光子数分布。这提供了确定腔中原子的存在或不存在的实用策略。提出的协议具有一些优势，例如可控的挤压强度和原子腔耦合强度的指数增加，这使得实验现象变得更加明显。我们希望该协议可以补充现有的腔内单原子检测方案，并为不同量子系统中的量子传感提供了希望。
We propose a protocol for detecting a single atom in a cavity with the help of the $χ^{(2)}$ nonlinear medium. When the $χ^{(2)}$ nonlinear medium is driven by an external laser field, the cavity mode will be squeezed, and thus one can obtain an exponentially enhanced light-matter coupling. Such a strong coupling between the atom and the cavity field can significantly change the output photon flux, the quantum fluctuations, the quantum statistical property, and the photon number distributions of the cavity field. This provides practical strategies to determine the presence or absence of an atom in a cavity. The proposed protocol exhibits some advantages, such as controllable squeezing strength and exponential increase of atom-cavity coupling strength, which make the experimental phenomenon more obvious. We hope that this protocol can supplement the existing intracavity single-atom detection protocols and provide a promise for quantum sensing in different quantum systems.
