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Quantum superposition demonstrated higher-order topological bound states in the continuum
Yao Wang1, Bi-Ye Xie2,3,4, Yong-Heng Lu1
1Center 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.
Light, Science & Applications
|August 31, 2021
Summary
Researchers experimentally observed higher-order topological bound states in the continuum in photonics. They developed a novel method using quantum superposition states to identify these unique topological corner states within the bulk spectrum.
Area of Science:
- Condensed Matter Physics
- Quantum Optics
- Materials Science
Background:
- Higher-order topological insulators exhibit topological phases beyond conventional bulk-boundary correspondence.
- Topological corner states are key indicators of higher-order topological insulators, typically found within the material's band gap.
Purpose of the Study:
- To experimentally observe higher-order topological phenomena in a photonic system.
- To introduce and validate a new method for identifying topological corner states.
- To extend the concept of topological bound states in the continuum to higher-order topological phases.
Main Methods:
- Fabrication of a photonic crystal exhibiting higher-order topological insulator properties.
- Experimental excitation of topological corner states using photonic quantum superposition states.
- Analysis of the time evolution of quantum states to distinguish corner states from bulk states.
Main Results:
- Experimental confirmation of higher-order topological bound states in the continuum (HOT-BICs) in a photonic system.
- Demonstration of corner states embedded within the bulk spectrum, not confined to the band gap.
- Successful separate excitation and identification of topological corner modes using quantum superposition states.
Conclusions:
- The study successfully realized and identified higher-order topological bound states in the continuum in photonics.
- A novel experimental approach utilizing quantum superposition states provides a robust method for detecting topological corner modes.
- These findings offer new avenues for creating localized states and exploring the interplay of quantum dynamics and higher-order topological photonics.
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