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

作　　者：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 

机构地区：[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

出　　处：《Light(Science & Applications)》2021年第9期1789-1796,共8页光（科学与应用)（英文版）

基　　金：This research is supported by the National Key R&D Programme of China(2017YFA0303700,2017YFA0303702,2017YFA0304203,2018YFA0306200,2019YFA0706302,and 2019YFA0308700);National Natural Science Foundation of China(11690033,61734005,11761141014,11625418,11890700,12034012,12074234,and 51732006);Science and Technology Commission of Shanghai Municipality(17JC1400403,and 2019SHZDZX01);Shanghai Municipal Education Commission(2017-01-07-00-02-E00049);IRT_17R70,1331KSC and 111 Project(D18001);China Postdoctoral Science Foundation Funded Project(2019M661784)。

摘　　要：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：SPECTRUM TOPOLOGICAL SUPERPOSITION 

分 类 号：O17[理学—数学]