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本文提出一种用参量下转换光子对偏振纠缠的特性实现的量子密码术实验方案，同Ｅｋｅｒｔ提出的基于参量下转换光子对时空纠缠特性的实验方案相比，本方案省掉了两个复杂的Ｍａｃｈ－Ｚｅｎｈｄｅｒ干涉仪和两个昂贵的单光子探测器，简化了系统装置。
In this paper, an experimental scheme of quantum cryptography using parametric down-conversion photon to polarize entanglement is proposed. Compared with the experimental scheme proposed by Ekert for time-space entanglement based on down-converted photon pairs, the proposed scheme eliminates two complex The Mach-Zenhder interferometer and two expensive single photon detectors simplify system setup.