Photonic state engineering via energy-level crossing by giant atoms in topological waveguide QED setup

• URL: http://arxiv.org/abs/2604.14660v1
• Date: Thu, 16 Apr 2026 06:15:27 GMT
• Title: Photonic state engineering via energy-level crossing by giant atoms in topological waveguide QED setup
• Abstract summary: Photonic state engineering in waveguide QED is typically based on local light-matter interactions.<n>Here, we demonstrate a distinct mechanism arising from the interplay between nonlocal giant-atom coupling and topological band structure.
• Score: 10.604902674937762
• License: http://creativecommons.org/publicdomain/zero/1.0/
• Abstract: Photonic state engineering in waveguide QED is typically based on local light-matter interactions. This limits its control over the spatial structure of bound photonic states. Here, we demonstrate a distinct mechanism arising from the interplay between nonlocal giant-atom coupling and topological band structure. Specifically, we consider giant atoms coupled to a Su-Schrieffer-Heeger waveguide and show that this configuration enables a controllable energy-level crossing protected by the topological gap. Adiabatically sweeping the atomic detuning across the crossing leads to a controlled exchange between distinct photonic bound states. In a two-giant-atom configuration, this mechanism achieves high-fidelity conversion of a spatially splitting state into a combining state. Extending this scheme to three-giant atoms, we further realize robust, shape-preserving photon transfer mediated by sequential in-gap crossings. Our results demonstrate how topology and nonlocal light-matter coupling can be combined to achieve programmable control of bound photonic states in waveguide QED platforms.

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