研究了自发参量下转换过程产生的轨道角动量纠缠光子对的联合探测概率,在忽略光子偏振和晶体为薄晶体的情况下推导出轨道角动量纠缠光子对联合探测概率的表达式。研究结果表明:自发参量下转换过程中抽运光、信号光以及空闲光参数(束腰、轨道角动量和径向指数)的大小决定着纠缠光子的联合探测概率。
The joint detection probability of orbital angular momentum entangled photons of spontaneous parametric down conversion process was studied. In the case of ignoring the polarization of photon with a thin crystal, expression of the joint detection probability of orbital angular momentum entangled photons was derived. It's shown that in the spontaneous parametric down conversion process, choice of pump photon, signal photon and idler photon, size of their parameters (waist, orbital angular momentum and radial index) affect the joint detection probability of entangled photons.