Recently, the study of non‐Hermitian physics has attracted considerable attention. The modified bulk‐boundary correspondence has been proposed to understand topological edge states in non‐Hermitian static systems. Here, a new experimental observation of edge states in non‐Hermitian time‐driven systems (quantum walks) is reported. Topologically edge states protected by Hermitian conjugation of particle–hole symmetry (PHS†) are found in the unbroken parity–time (PT)‐symmetric phase. When the system changes from the unbroken to the broken PT‐symmetric phase, the topological phase transition occurs accompanied by the change of the number of edge states. The robust properties of these edge states against static perturbations and disorder are also demonstrated experimentally. The finding of robust edge states in non‐Hermitian systems inspires to explore a robust transport channel in ubiquitously complex systems with strong dissipation.

中文翻译：

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耗散非埃尔米特量子游动中新型稳健边沿状态的观测

最近，对非埃尔米特物理学的研究引起了相当大的关注。提出了修改后的体边界对应关系，以了解非厄密静态系统中的拓扑边缘状态。在此，报告了一种新的实验观察，该实验观察了非埃尔米特时间驱动系统（量子游走）中的边缘状态。在不间断的奇偶-时间（PT）-对称相中发现了受粒子-空穴对称性（PHS†）的埃尔米特共轭保护的拓扑边缘状态。当系统从完整的PT对称相变为不完整的PT对称相时，拓扑相变会伴随边沿状态数的变化而发生。还通过实验证明了这些边缘状态对静态扰动和无序的鲁棒性。