Abstract
Weakly squeezed vacuum light, especially when resonant with an atomic transition, plays an important role in quantum storage and the generation of various quantum sources. However, achieving a weak squeezing measurement with a precision better than 0.01 dB by means of typical homodyne detection (HD) is still very challenging due to the low signal-to-noise ratio and the limited resolution of HD systems. Here, we provide an alternative method based on photon statistics measurement to determine the weak squeezing of the squeezed vacuum light generated from an optical parametric oscillator (OPO) working far below the threshold, and we establish the relationship between the squeezing parameter and the second-order degree of coherence. The experimental results agree well with the theoretical analysis. The advantages of this method are that it provides a feasible and reliable experimental measure to determine weak squeezing with high precision and that the measurement is independent of the detection efficiency. This method can be used to measure other quantum features for various quantum states with extremely weak nonclassicality.
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