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Quantum superposition demonstrated higher-order topological bound states in the continuum
Light: Science & Applications ( IF 19.4 ) Pub Date : 2021-08-30 , DOI: 10.1038/s41377-021-00612-8
Yao Wang 1 , Bi-Ye Xie 2, 3, 4 , Yong-Heng Lu 1 , Yi-Jun Chang 1 , Hong-Fei Wang 2, 3 , Jun Gao 1 , Zhi-Qiang Jiao 1 , Zhen Feng 1 , Xiao-Yun Xu 1 , Feng Mei 5, 6 , Suotang Jia 5, 6 , Ming-Hui Lu 2, 3, 7, 8 , Xian-Min Jin 1
Affiliation  

Higher-order topological insulators, as newly found non-trivial materials and structures, possess topological phases beyond the conventional bulk-boundary correspondence. In previous studies, in-gap boundary states such as the corner states were regarded as conclusive evidence for the emergence of higher-order topological insulators. Here, we present an experimental observation of a photonic higher-order topological insulator with corner states embedded into the bulk spectrum, denoted as the higher-order topological bound states in the continuum. Especially, we propose and experimentally demonstrate a new way to identify topological corner states by exciting them separately from the bulk states with photonic quantum superposition states. Our results extend the topological bound states in the continuum into higher-order cases, providing an unprecedented mechanism to achieve robust and localized states in a bulk spectrum. More importantly, our experiments exhibit the advantage of using the time evolution of quantum superposition states to identify topological corner modes, which may shed light on future exploration between quantum dynamics and higher-order topological photonics.



中文翻译:

量子叠加证明了连续体中的高阶拓扑束缚态

高阶拓扑绝缘体作为新发现的重要材料和结构,具有超越传统体边界对应的拓扑相。在之前的研究中,带隙内边界态(例如角态)被认为是高阶拓扑绝缘体出现的决定性证据。在这里,我们提出了对光子高阶拓扑绝缘体的实验观察,其角态嵌入到体光谱中,表示为连续体中的高阶拓扑束缚态。特别是,我们提出并通过实验证明了一种通过光子量子叠加态与体态分开激发拓扑角态来识别拓扑角态的新方法。我们的结果将连续体中的拓扑束缚态扩展到高阶情况,提供了一种前所未有的机制来在体谱中实现鲁棒和局域态。更重要的是,我们的实验展示了利用量子叠加态的时间演化来识别拓扑角模式的优势,这可能有助于量子动力学和高阶拓扑光子学之间的未来探索。

更新日期:2021-08-30
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