Quantum superposition demonstrated higher-order topological bound states in the continuum

Yao Wang; Bi-Ye Xie; Yong-Heng Lu; Yi-Jun Chang; Hong-Fei Wang; Jun Gao; Zhi-Qiang Jiao; Zhen Feng; Xiao-Yun Xu; Feng Mei; Suotang Jia; Ming-Hui Lu; Xian-Min Jin

doi:10.1038/s41377-021-00612-8

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Quantum superposition demonstrated higher-order topological bound states in the continuum

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- Quantum superposition demonstrated higher-order topological bound states in the continuum
- Light: Science & Applications Vol. 10, Issue 9, Pages: 1789-1796(2021)
- Affiliations：
  
  1.Center for Integrated Quantum Information Technologies (IQIT), School of Physics and Astronomy and State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai, 200240, China
  2.National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China
  3.Department of Materials Science and Engineering, Nanjing University, Nanjing, 210093, China
  4.Department of Physics and HKU-UCAS Joint Institute for Theoretical and Computational Physics at Hong Kong, The University of Hong Kong, Hong Kong, China
  5.State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan, Shanxi, 030006, China
  6.Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi, 030006, China
  7.Jiangsu Key Laboratory of Artificial Functional Materials, Nanjing, 210093, China
  8.Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
- Author bio：
  
  Feng Mei (meifeng@sxu.edu.cn)
  Ming-Hui Lu (luminghui@nju.edu.cn)
  Xian-Min Jin (xianmin.jin@sjtu.edu.cn)
- Funds：
- DOI：10.1038/s41377-021-00612-8
  CLC：
- Published：30 September 2021，
  
  Published Online：30 August 2021，
  
  Received：10 June 2021，
  
  Revised：26 July 2021，
  
  Accepted：09 August 2021
- Accepted：
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Wang Y. et al. Quantum superposition demonstrated higher-order topological bound states in the continuum. Light: Science & Applications, 10, 1789-1796 (2021).
DOI：

Wang Y. et al. Quantum superposition demonstrated higher-order topological bound states in the continuum. Light: Science & Applications, 10, 1789-1796 (2021). DOI： 10.1038/s41377-021-00612-8.

摘要

Abstract

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.

关键词

Keywords

references

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