Dynamics of Giant Atom Coupled with Disordered Lattices

Abstract: While ideal lattice models have been widely used to study giant-atom-lattice systems, they often neglect the disorder induced by defects during experimental fabrication. This work systematically explores the dynamics of a giant atom coupled to a disordered lattice characterized by random eigenfrequency fluctuations. By analyzing atomic excitation probabilities, photon dynamics, and energy spectra, we reveal that the system exhibits remarkable robustness when disorder is confined within a specific range. The atomic excitation probability remains stable, the lattice evolution process shows reproducibility, and the energy spectrum structure is minimally distorted. Notably, we introduce a quantitative parameter to measure non-Markovianity and demonstrate that disorder significantly influences the system's memory effects. These findings provide insights into the interplay between disorder, non-Markovianity, and photon dynamics, with potential applications in quantum information processing and the design of robust quantum devices.