强场激发Rydberg态的激光包络调控  

Laser envelope control of strong field excited Rydberg states

作　　者：赵零一 刘金磊 江涛 郎跃 赵增秀[1,2] Zhao Ling-Yi;Liu Jin-Lei;Jiang Tao;Lang Yue;Zhao Zeng-Xiu(College of Science,National University of Defense Technology,Changsha 410073,China;Hunan Key Laboratory of Extreme Matter and Applications,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学理学院,长沙410073 [2]国防科技大学,湖南省极端条件物理及应用重点实验室,长沙410073

出　　处：《物理学报》2024年第24期71-76,共6页Acta Physica Sinica

基　　金：国家重点研发计划(批准号:2019YFA0307703);国家自然科学基金(批准号:12234020,12274461,11974426);湖南省自然科学基金(批准号:211141972034);国防科技大学学校科研项目(批准号:ZK22-31)资助的课题.

摘　　要：强激光相干激发为Rydberg态的产生和调控提供了新的手段.本文主要研究不对称包络强激光场中Rydberg态产生的动力学过程,发现Rydberg态的产率随激光包络上升沿的持续时间延长而增加.利用电离率与随时间变化的再捕获率的乘积计算Rydberg态的布居,将定量再散射理论推广到强场激发过程中.通过分析Rydberg态的产生窗口,得到了再捕获率的解析公式,发现再捕获率与包络形状呈负相关,并随剩余相互作用时间的延长而减小.利用激光包络影响Rydberg态产生的新机理,为强场激发原子分子的超快动力学提供了新的调控手段,也为基于Rydberg原子的超快量子信息技术提供了新的方案.Rydberg atoms are important building blocks for quantum technologies,and because of their unique tunable quantum properties,they possess new applications in quantum computing,quantum communication,and quantum sensing.Besides the widely-used few-photon resonant excitation for the specific Rydberg state,multiple Rydberg states can be populated coherently and efficiently through the frustrated tunneling ionization or the Coulomb potential recapture effect in a strong laser field.The excitation of Rydberg states in a strong field provides an opportunity for realizing the ultrafast quantum control on Rydberg atom and bridging the gap between strong field physics and quantum information technology.Using the classical trajectory Monte Carlo method and Qprop package to solve time-dependent Schrödinger equation,we calculate the population of Rydberg states.Our results show that the population increases with the increase of parameter of the asymmetric laser envelope.Based on the quantitative rescattering theory,the calculated time-dependent recapture rate is negatively related to the laser envelope and the residual laser interaction time,which is termed the envelope effect.Combined with the carrier-wave effect,an analytic formula can be used to calculate the Rydberg state population:■■■■■.This result opens the way to enhancing the generation of Rydberg states by using the laser envelope control,which is beneficial to the future quantum technology based on the Rydberg states generated in the strong laser field.

关 键 词：RYDBERG 态 强场激发 超快动力学 

分 类 号：O56[理学—原子与分子物理] TN24[理学—物理]