中文摘要：

介绍了三能级结构单分子光子源的工作原理,研究了利用Hanbury-Brown-Twiss探测方法,记录两个单光子计数器响应的单分子光子源输出的每一个事件,分析单事件的光子统计概率P（n,n=0,1,2）与Mandel参数.研究结果表明,当信号背景比SBR＞2.41时,P（2）＜（2-√4-2n^-）^2 /2是判别单分子的充分条件,n^-为每个激发周期内探测到的平均光子数。

英文摘要：

The principle of single photon source based on three-levels single molecule is introduced. By use of Hanbury-Brown-Twiss method, the photon statistics P（n, n = 0,1,2） and the Mandel parameter are analyzed by recording of every photo-electrical event from the single photon source. When signal to background ratio SBR 〉 2. 4, an efficient method to distinguish single molecules by the double-photon statistics probability P （2）, which shows P（2） 〈 1/2 （2 -√4 -2n^-）^2 , is presented. Here, n is the mean photon number.