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We study phase-dependent fluctuations of the resonance fluorescence of asingle $\Lambda$-type three-level atom in the regime near coherent populationtrapping, i.e., alongside the two-photon detuning condition. To this end, weemploy the method of conditional homodyne detection (CHD) which considerssqueezing in the weak driving regime, and extends to non-Gaussian fluctuationsfor saturating and strong fields. In this framework, and using estimatedparameter settings of the resonance fluorescence of a single trapped $^{138}\mathrm{Ba}^{+}$ ion, the light scattered from the probe transitions is foundto manifest a non-classical character and conspicuous asymmetric third-orderfluctuations in the amplitude-intensity correlation of CHD.

Phase-dependent fluctuations of resonance fluorescence near the coherent population trapping condition