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探索制备纠缠光子对的新途径是量子光学领域的一个研究热点 .从理论上证明在准周期极化的光学超晶格晶体中的级联参量过程能够产生纠缠光子对 .分别利用脉冲和连续的 5 32nm抽运光在一块准周期极化的LiTaO3晶体中同时实现非简并参量下转换 (产生信号光与闲置光 )与和频 (闲置光与抽运光和频生成和频光 )的级联参量过程 ,获得 6 30nm的信号光与 4 6 0nm的和频光 .指出信号光与和频光之间存在纠缠关联性质 .该方案的优点是可产生短波长的纠缠光子对 .
Exploring a new approach to the preparation of entangled photon pairs is a hot topic in the field of quantum optics.It has been theoretically proved that the cascaded parametric process can produce entangled photon pairs in quasiperiodic polarized optical superlattice crystals.Pulse and continuous 5 32nm pumped light In a quasi-periodically polarized LiTaO3 crystal, both nondegenerate parametric down-conversion (generating signal light and idle light) and sum frequency (idle light and pumping light and frequency generating and frequency light) The parametric process of 6-nm and 660-nm sum-frequency signals is obtained, which indicates the existence of the entanglement relation between the signal light and the sum frequency light.The advantage of this scheme is that it can generate the entangled photon pairs with short wavelength.