A giant atom with modulated transition frequency

Abstract

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.

Graphical abstract

Keywords

giant atoms / frequency modulation / spontaneous emission dynamics / non-Markovian retardation effect

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 12074030 and 12274107) and the Science Foundation of the Education Department of Jilin Province (Grant No. JJKH20211279KJ).

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