驱动少阱中少原子隧穿动力学的相干控制

项目名称： 驱动少阱中少原子隧穿动力学的相干控制

项目编号： No.11205021

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II

项目作者： 鲁耿彪

作者单位： 长沙理工大学

项目金额： 22万元

中文摘要： 激光场与原子相互作用是控制原子运动状态的有效途径，利用激光场实现少阱系统中少原子隧穿动力学的相干控制已成为量子调控领域一个非常重要的研究方向。本项目拟在Floquet理论框架下，利用解析分析与数值模拟相结合的手段，通过研究驱动少阱中少玻色原子系统的准能谱结构及量子Floquet态与非Floquet态，展示外场参数取在经典规则和混沌区域时原子的隧穿特性，阐明经典系统中的混沌与其全量子化模型所描述的原子隧穿动力学间的关联。分析外场作用下具有相互作用的少原子系统中单原子隧穿与关联对隧穿的参数区域，深入理解原子间的相互作用、外界环境所导致的耗散与外场间的竞争对原子隧穿动力学的影响，揭示不同外场参数区域原子的量子涨落、量子纠缠、以及量子态保真度等量子特征。基于这些研究结果，我们进一步提出如何利用激光场实现少阱中少原子隧穿动力学的相干控制的方案，并分析其在量子信息处理及设计新型原子器件等方面的应用。

中文关键词： 相干操控；周期驱动；冷原子；隧穿动力学；Floquet理论

英文摘要： The interaction betweeen laser field and atom is an effective way to control the motion of atom, and the coherent control of tunneling dynamics for few atoms in a few-well system driven by laser field has become a very important research branch. Applying the Floquet thoery in our project, we investigate the quasienergy spectrum structure, quantum Floquet and non-Floquet states of a driven few-Boson system by analytical and numerical methods. By the analysis of Floquet thoery, we show the qunatum tunneling properties of few atoms as the driving parameters are adjusted into classically regular and chaotic regions respectively and elucidate the relation between the chaos of calssical system and the tunneling dynamics described by the full-quantum model. Simultaneously, we analyze the parameter region that exhibit the single atom tunneling and correlated pair tunneling in few-atom system with interatomic interaction, and get an insight into the influence of competition among the interatomic interaction, the dissipation induced by external environment and the driving field on quantum tunneling of atom. For different driving parameters, we reveal the quantum properties of few atoms, such as quantum fluctuation,quantum entanglement and fidelity of quantum state,etc. Further, based on our results, we propose correspondi

英文关键词： coherent control；periodically driving；cold atom；tunneling dynamics；Floquet theory