四能级倒Y型原子-环形腔耦合系统中非线性效应及窄带明亮纠缠光束产生的研究

项目名称： 四能级倒Y型原子-环形腔耦合系统中非线性效应及窄带明亮纠缠光束产生的研究

项目编号： No.61205112

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 信息四处

项目作者： 陈海霞

作者单位： 西安交通大学

项目金额： 29万元

中文摘要： 通过光场与非线性原子介质的相互作用，在梯型原子能级系统中利用EIT技术产生非简并四波混频光场，使四波混频光场在环形谐振腔中谐振后输出，通过控制原子系统的温度，使原子系统和腔之间实现强耦合，研究原子系统和腔之间的强耦合对四波混频透射谱的作用；然后引入参量可控的强光场和原子系统耦合形成倒Y型能级，在此原子能级系统中，同时研究强耦合作用和强光场的光场缀饰作用对四波混频透射场的作用，实现可控性更高的非线性四波混频过程；其次利用工作于阈值以上的环形谐振腔中的四波混频过程在实验上得到明亮的具有量子关联特性的纠缠光束；最后，研究倒Y型四能级原子和腔耦合系统中存在的多对纠缠光束及这些纠缠光束的量子关联特性，为下一步实现多色纠缠做准备。利用EIT和非简并四波混频过程在原子系统中产生的纠缠光束，具有线宽窄，相干时间长和产生效率高等优点，因此本项目的研究将在远距离量子通讯，量子存储等方面产生十分重要的应用价值。

中文关键词： 原子系统；环形谐振腔；四波混频；电磁感应透明；纠缠

英文摘要： By the interaction between the laser fields and the nonlinear medium, a nondegenerate four-wave mixing (FWM) signal is generated in the ladder-type atomic system based on electromagnetically induced transparency (EIT). Make the FWM signal resonant with the ring cavity, and then the transmission spectrum of the FWM signal is obtained. The strong-coupling regime of the atom-cavity system can be reached by controlling the temperate of the atomic system, and then the transmission spectrum of the FWM signal is studied in this regime. The influence of the atom-cavity interaction on the transmission spectrum of the FWM signal can be get through it. Another high-intensity laser field, which is called as the dressing field, interacts with the atomic system to introduce a dressing interaction to the FWM signal. So it can be theoretically and experimentally studied in the inverted-Y atomic system how the atom-cavity interaction and dressing interaction of the strong laser field impact the transmission spectrum of the FWM signal. The bight narrow-band entangled beams are experimentally generated through the FWM process in the optical cavity above the threshold. Finally, not only the generation of the many pairs of entangled beams but also their quantum correlation characters are studied in the inverted-Y system. The entangl

英文关键词： atomic system；ring resonator；four-wave mixing；electromagnetically induced transparency；entanglememt