Insights into Single-Photon Scattering in Topological-Waveguide QED Systems

Recent research has explored the dynamics of single-photon scattering in giant-atom topological-waveguide quantum electrodynamics (QED) systems. The study, titled "Single-photon scattering in giant-atom topological-waveguide-QED systems," was authored by Hai Zhu, Xian-Li Yin, and Jie-Qiao Liao and was submitted to arXiv on August 26, 2024.

The research focuses on the interaction of light with matter, particularly how single photons behave when they encounter a waveguide coupled to one or two two-level giant atoms. The authors utilized a Su-Schrieffer-Heeger (SSH) waveguide model, examining various coupling configurations and distances between the atoms and the waveguide. They found that by adjusting these parameters, a single photon can either be completely reflected or transmitted.

Key findings include:

• The ability to modulate the scattering spectra periodically based on the coupling-point distances.
• The emergence of different scattering spectra shapes, including Lorentzian and asymmetric Fano line shapes, depending on the coupling configurations.
• The influence of quantum interference and topological effects on the collective behavior of the two giant atoms.

These results could have significant implications for the development of controllable single-photon devices, which are essential for advancements in quantum communication and computing technologies. The full paper can be accessed at arXiv:2408.14178.