太赫兹里德堡态下阻塞效应的调控研究  

Regulation of blockade effect in terahertz-dressed Rydberg states

作　　者：张金标 彭瑞杰 彭滟[1] ZHANG Jinbiao;PENG Ruijie;PENG Yan(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《光学仪器》2024年第1期8-14,共7页Optical Instruments

基　　金：国家自然科学基金(61922059)。

摘　　要：里德堡原子具有很大的极化率和跃迁偶极矩,因此它对外界电磁场非常敏感,结合量子干涉效应可实现太赫兹场的高灵敏度探测。采用外加电场的方式来调谐太赫兹里德堡激发态能级至Förster共振,转变了原子间相互作用的方式,进而改变了阻塞区域的大小。通过对比范德瓦耳斯和偶极–偶极2种作用方式下的主量子数以及共振激光拉比频率的变化对阻塞区域的影响,发现Förster共振电场调谐下的偶极–偶极相互作用导致的阻塞效应更强,造成的阻塞区域半径可以是范德瓦耳斯相互作用下的2~3倍。根据这一特点,可利用外电场调控里德堡原子间相互作用来增强阻塞效应,这对太赫兹里德堡跃迁中高质量单光子的制备以及原子检测准确度的提高具有参考意义。Rydberg atoms have large polarizabilities and transition dipole moments.They are extremely sensitive to external electric fields.Combining with the quantum interference effect,terahertz fields can be measured with high sensitivity.In this paper,we use a weak DC external electric field to tune the Rydberg state level to Förster resonance,thereby tuning the Rydberg pair interaction from the van der Waals interaction regime to the dipole-dipole interaction regime.This process creates an enhanced blockade effect and then enlarges the corresponding blockade region.The results show that the dipole-dipole interaction-induced blockade region can be 2-3 times larger than that of the van der Waals interaction.According to this characteristic,the external electric field can be used to enhance the blockade effect,which has reference significance for preparing highquality unidirectional atoms and improving the accuracy of atomic detection in the terahertzdressed Rydberg transition.

关 键 词：里德堡原子 原子相互作用 阻塞效应 Förster共振 太赫兹波 

分 类 号：O562[理学—原子与分子物理]