各向异性量子拉比模型中局域体态间的拓扑边缘态观测
Observation of a topological edge state among localized bulk states in the anisotropic quantum Rabi model
- Sungkyunkwan University（成均馆大学）
- SKKU Advanced Institute of Nanotechnology & Department of Nano Science and Technology (SAINT), Sungkyunkwan University（成均馆大学纳米科学技术高级研究所与纳米科学与技术系（SAINT））
- Sandia National Laboratories（桑迪亚国家实验室）
- Korea University（高丽大学）
- Department of Physics, Korea University（高丽大学物理系）
- Department of Quantum Information Engineering, Sungkyunkwan University（成均馆大学量子信息工程系）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究在离子阱量子模拟器中观测各向异性量子拉比模型的拓扑边缘态，通过手性和自旋-玻色子可分离性等内在拓扑特征将其与局域体态区分，并揭示其玻色子分量为压缩真空态，压缩度达6.45 dB。
AI中文摘要：
拓扑相由离散对称性支配，这些对称性保护边界模式免受局部扰动的影响。当平移周期性缺失时，体态也变得局域化，因此拓扑边缘态无法仅通过空间局域性与之区分。在此，我们在离子阱量子模拟器中研究了各向异性量子拉比模型（AQRM）的拓扑边缘态（TES）和体本征态。AQRM在一维合成晶格中承载拓扑相，其平移对称性被随格点索引变化的非均匀耦合所破坏。尽管TES和体态都表现出局域分布，我们发现TES展现出明确的手性和近乎完全的自旋-玻色子可分离性，作为拓扑相的特征，与体态形成对比。相空间层析进一步揭示TES的玻色子分量为压缩真空态，压缩度高达6.45 dB。这些结果通过其内在的拓扑特征识别了TES，并确立了本征态级表征作为探测拓扑现象的途径。
英文摘要：
Topological phases are governed by discrete symmetries that protect boundary modes against local perturbations. When translational periodicity is absent, the bulk states also become localized, so that a topological edge state can no longer be distinguished from them by spatial localization alone. Here, we investigate the topological edge state (TES) and bulk eigenstates of the anisotropic quantum Rabi model (AQRM) in a trapped-ion quantum simulator. The AQRM hosts a topological phase in a one-dimensional synthetic lattice, whose translational symmetry is broken by the non-uniform couplings scaling with the site index. While both the TES and bulk states show localized distributions, we find that the TES exhibits well-defined chirality and near-complete spin--boson separability as signatures of the topological phase, in contrast to the bulk states. Phase-space tomography further reveals that the bosonic component of the TES is a squeezed vacuum state, with squeezing up to 6.45 dB. These results identify the TES through its intrinsic topological signatures and establish eigenstate-level characterization as a route to probing topological phenomena.
