A giant atom with modulated transition frequency  

作　　者：Lei Du Yan Zhang Yong Li 

机构地区：[1]Center for Theoretical Physics and School of Science,Hainan University,Haikou 570228,China [2]Beijing Computational Science Research Center,Beijing 100193,China [3]Center for Quantum Sciences and School of Physics,Northeast Normal University,Changchun 130024,China [4]Synergetic Innovation Center for Quantum Effects and Applications,Hunan Normal University,Changsha 410081,China

出　　处：《Frontiers of physics》2023年第1期209-218,共10页物理学前沿（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.12074030 and 12274107);the Science Foundation of the Education Department of Jilin Province(Grant No.JJKH20211279KJ).

摘　　要：Giant atoms are known for the frequency-dependent spontaneous emission and associated interference effects.In this paper,we study the spontaneous emission dynamics of a two-level giant atom with dynamically modulated transition frequency.It is shown that the retarded feedback effect of the giant-atom system is greatly modified by a dynamical phase arising from the frequency modulation and the retardation effect itself.Interestingly,such a modification can in turn suppress the retarded feedback such that the giant atom behaves like a small one.By introducing an additional phase difference between the two atom-waveguide coupling paths,we also demonstrate the possibility of realizing chiral and tunable temporal profiles of the output fields.The results in this paper have potential applications in quantum information processing and quantum network engineering.

关 键 词：giant atoms frequency modulation spontaneous emission dynamics non-Markovian retardation effect 

分 类 号：O562[理学—原子与分子物理]