Giant atom with disorders: Effects from imperfect couplings
Phys. Rev. A 113, 013716 – Published 12 January, 2026
DOI: https://doi.org/10.1103/1px2-2db4
Abstract
The study of giant atoms goes beyond the local interaction paradigm in conventional quantum optics and predicts novel phenomena, such as oscillating bound states in the continuum (BICs) and decoherence-free interaction, which do not exist in small atoms, for some particular parameter settings of coupling positions and strengths. However, in realistic experiments to implement giant-atom systems, there is always some level of disorder both in coupling positions and strengths. In this work, we investigate the effects of disorder on the phenomena related to giant atoms. We find that the giant-atom-related phenomena are robust to disorders of both coupling positions and strengths in the Markovian regime but more sensitive to the disorder of coupling positions in the non-Markovian regime. Our work shows that, to observe non-Markovian phenomena such as (oscillating) BICs in giant-atom systems, more precision is needed to control the disorder of coupling positions than that of the coupling strengths in the experiments.
