Joint photocount distributions of a weak twin beam acquired by an iCCD camera are analyzed with respect to the beam spatial correlations. A method for extracting these correlations from the experimental joint photocount distributions is suggested using a suitable statistical model that quantifies the contribution of spatial correlations to the joint photocount distributions. In detail, the profile of twin-beam intensity spatial cross-correlation function is revealed from the curve that gives the genuine mean photon-pair number (both photons from a pair are detected) as a function of the extent of the detection area. Also, the principle of reducing the noise in photon-number-resolving detection by using spatial correlations is experimentally demonstrated.
翻译：结合射线空间相关关系,对iCCD相机获得的微弱双光束的光计分布进行了分析,建议采用适当的统计模型从实验性联合光计分布中提取这些相关关系的方法,该模型将空间相关关系对联合光算分布的贡献进行量化,详细来说,双光束强度空间交叉关系功能的剖面从曲线中揭示出,曲线显示真实的平均光子-光波数(双对光子都检测到)是探测范围的一个函数。此外,还实验性地展示了通过使用空间关联减少光子数字解析探测噪音的原则。
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