Topology-dependent giant-atom interaction in a topological waveguide QED system
Dawei Wang, Chengsong Zhao, Ye‐Ting Yan, Junya Yang, Zhihai Wang, Ling Zhou
Abstract
We investigate topology-dependent giant-atom--photon bound states in a giant-atom coupled topological waveguide system and find that the bound states can induce topology-dependent dipole-dipole interactions between giant atoms. For bridged giant atoms, when the waveguide is in the topological phase, there is no interaction between them and the atom-atom interaction can only survive in the trivial phase. Conversely, for separated giant atoms, they interact with each other only in the topological phase rather than in the trivial phase. The characteristics of these two cases provide us a way to model pure nearest-neighbor interactions and double chains, respectively. Our work may promote the application of topological physics in quantum information processes and quantum simulations.