Simple and practical method of characterizing the parametric down-conversion source
Wang Dong1, 2, †, Wu Juan1, 2, †, Zhao Liang-Yuan1, 2, An Xue-Bi1, 2, Yin Zhen-Qiang1, 2, ‡, Chen Wei1, 2, ‡, Han Zheng-Fu1, 2, ‡, Wang Qin3, ‡
       

The heralded second-order autocorrelation function measured at different pump powers.