由于独特的物理特性和潜在的应用前景，近年来宇称-时间（Parity-time；PT）反演对称结构引起了人们的极大关注。本项目将开展基于相干原子系综的PT对称结构的物理实现，研究相干原子PT对称模型中的线性和非线性光学响应，并讨论其在光量子信息处理以及精密测量中的应用。内容包括：（1）建立基于光与多能级原子相互作用的、具有不同外势和非线性形式的PT对称模型，提出实现PT对称结构的最佳实验方案，并拓展高维和多分量的PT对称模型。（2）研究不同维度和分量下相干原子PT对称介质的色散、衍射、及非线性效应的相互竞争以及对介质中光的传播产生的影响，研究光在介质中的线性和非线性传播特性。（3）讨论该模型在光量子信息处理以及精密测量中的应用。本项目的研究不仅为PT对称模型提供新的实验平台，对揭示相干原子PT对称系统的量子干涉与新奇非线性以及探索该系统在光量子信息处理与精密测量中的应用均有重要意义。

Due to their unique physical properties and potential applications, in recent years great attention has been paid to the study of parity-time (PT) symmetric structures. In this project, we shall investigate the physical realization of PT symmetric structures based on coherent atomic ensembles, study the linear and nonlinear propagations of lights in atomic PT symmetric models, and discuss their applications in optical quantum information processing and precission measurment. The project include: (1) building PT structures based on light-atom interacting systems with different forms of potential and nonlinearity, providing the best experimental scheme, and extending to high-dimensional and multi-component models; (2) investigating the competition between the effects of dispersion, diffraction, and nonlinearity, studying the linear and nonlinear propagations of lights in atomic PT symmetric models; (3) discussing the applications of atomic PT symmetric models in optical quantum information processing and precission measurment. The implementation of this project is of importance for the finding of new experimental platform for atomic PT symmetric models, for the demonstration of quantum interference and novel nonlinearity of atomic PT symmetric models, and for the finding of potential applications in optical quantum information processing and precission measurment.