We study phase-dependent fluctuations of the resonance fluorescence of a single Λ-type three-level atom in the regime near coherent population trapping, i.e. alongside the two-photon detuning condition. To this end, we employ the method of conditional homodyne detection (CHD) which considers squeezing in the weak driving regime, and extends to non-Gaussian fluctuations for saturating and strong fields. In this framework, and using estimated parameter settings of the resonance fluorescence of a single trapped ¹³⁸Ba⁺ ion, the light scattered from the probe transitions is found to manifest a non-classical character and conspicuous asymmetric third-order fluctuations in the amplitude-intensity correlation of CHD.

我们研究了在相干布居俘获附近的区域中，即在双光子失谐条件旁边，单个 Λ 型三能级原子的共振荧光的相位相关波动。为此，我们采用条件零差检测 (CHD) 方法，该方法考虑了弱驱动机制中的挤压，并扩展到饱和场和强场的非高斯波动。在这个框架中，并使用单个被捕获的¹³⁸ Ba ⁺离子的共振荧光的估计参数设置，发现从探针跃迁散射的光表现出非经典特征和显着的不对称三阶振幅-强度波动CHD的相关性。