In the previous section, we discussed the principle of measuring the quantum second-order correlation function with a non-photon-number-resolving single-photon detector in the HBT experiment. https://zhuanlan.zhihu.com/p/679453473 In this section, let’s see what the quantum second-order correlation function is used for. In addition to the common uses such as distinguishing between super-Poissonian statistics/Poissonian statistics/sub-Poissonian statistics and distinguishing between photon bunchi...