超冷里德堡气体中合作光学非线性研究

项目名称： 超冷里德堡气体中合作光学非线性研究

项目编号： No.11204019

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 严冬

作者单位： 长春大学

项目金额： 25万元

中文摘要： 超冷里德堡气体中，原子间强烈的偶极-偶极相互作用产生偶极阻塞效应，这种效应映射到电磁感应透明（EIT）透射光谱中产生依赖于探测场强度、原子密度的合作非线性现象。利用这种新奇的非线性现象可以实现可靠的单光子源和单光子操控，这些研究对于量子信息处理和量子光学有着极其重要的意义。本项目拟在超冷里德堡气体中就合作非线性展开深入系统的研究。 具体内容是：（1）建立可行的原子模型，实现可控的稳态合作非线性EIT和普通的EIT透射光谱以及相互转化，并就这两种EIT窗口简并情况下呈现出特有的现象给出物理解释和潜在应用。此外，考察与合作非线性紧密相关的双光子关联性质，从而研究反聚束效应。（2）在双里德堡能级结构中研究基于偶极阻塞效应稳态EIT的合作非线性性质，同时考察由两个不同强度的范德瓦尔斯作用主导的原子激发行为。（3）在涉及里德堡能级的三能级梯形模型中研究瞬态EIT的合作非线性和原子激发的动力学行为。

中文关键词： 里德堡原子；偶极阻塞；偶极-偶极相互作用；电磁感应透明；合作光学非线性

英文摘要： The strong dipole-dipole interactions between atoms in an ultracold Rydberg gas generate a so-called dipole blockade effect. Electromagnetically induced transparency (EIT) can map this effect onto the optical transmission spectra, resulting in a cooperative nonlinearity which depends on the probe power and density of atoms. This novel nonlinearity can be used to realize the reliable single-photon sources and manipulate light at the single photon level, which are very significant for the quantum information processing and the quantum optics. This project plans to investigate the cooperative optical nonlinearity in an ultracold Rydberg gas systematically and thoroughly. The concrete content is as follows:(1)The controllable steady transmission spectra of both the cooperative nonlinear EIT and the general EIT are obtained, and they can be converted to one another by constituting a feasible atomic model. We also interpret physically the results and give some potential applications in the case of a degenerate EIT window. Moreover, the antibunching effect is considered by studying the two-photon correlation which is closely related to the cooperative nonlinearity.(2)In a double Rydberg-energy-level configuration, the cooperative nonlinearity properties of the steady EIT are investigated based on the dipole blocka

英文关键词： Rydberg atom；diploe blockade；dipole-dipole interaction；electromagnetically induced transparency；cooperative optical nonlinearity