Fractal photonic anomalous Floquet topological insulators to generate multiple quantum chiral edge states

Meng Li; Chu Li; Linyu Yan; Qiang Li; Qihuang Gong; Yan Li

doi:10.1038/s41377-023-01307-y

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Fractal photonic anomalous Floquet topological insulators to generate multiple quantum chiral edge states

Original Articles

- Fractal photonic anomalous Floquet topological insulators to generate multiple quantum chiral edge states
- Light: Science & Applications Vol. 12, Issue 11, Pages: 2498-2507(2023)
- Affiliations：
  
  1.State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
  2.Frontiers Science Center for Nano-Optoelectronics, Peking University, Beijing 100871, China
  3.Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
  4.Hefei National Laboratory, Hefei 230088, China
  5.Peking University Yangtze Delta Institute of Optoelectronics, Nantong 226010, China
- Author bio：
  
  Meng Li (mengli2016@pku.edu.cn)
  Yan Li (li@pku.edu.cn)
- Funds：
- DOI：10.1038/s41377-023-01307-y
  CLC：
- Published：30 November 2023，
  
  Published Online：02 November 2023，
  
  Received：29 May 2023，
  
  Revised：08 October 2023，
  
  Accepted：14 October 2023
- Accepted：
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Li, M. et al. Fractal photonic anomalous Floquet topological insulators to generate multiple quantum chiral edge states. Light: Science & Applications, 12, 2498-2507 (2023).
DOI：

Li, M. et al. Fractal photonic anomalous Floquet topological insulators to generate multiple quantum chiral edge states. Light: Science & Applications, 12, 2498-2507 (2023). DOI： 10.1038/s41377-023-01307-y.

摘要

Abstract

Anomalous Floquet topological insulators with vanishing Chern numbers but supporting chiral edge modes are attracting more and more attention. Since the existing anomalous Floquet topological insulators usually support only one kind of chiral edge mode even at a large lattice size

they are unscalable and unapplicable for multistate topological quantum systems. Recently

fractal topological insulators with self-similarity have been explored to support more nontrivial modes. Here

we demonstrate the first experimental realization of fractal photonic anomalous Floquet topological insulators based on dual Sierpinski carpet consisting of directional couplers using the femtosecond laser direct writing. The fabricated lattices support much more kinds of chiral edge states with fewer waveguides and enable perfect hopping of quantum states with near unit transfer efficiency. Instead of zero-dimensional bound modes for quantum state transport in previous laser direct-written topological insulators

we generate multiple propagating single-photon chiral edge states in the fractal lattice and observe high-visibility quantum interferences. These suggest the successful realization of highly indistinguishable single-photon chiral edge states

which can be applied in various quantum operations. This work provides the potential for enhancing the multi-fold manipulation of quantum states

enlarging the encodable quantum information capacity in a single lattice via high-dimensional encoding and many other fractal applications.

关键词

Keywords

references

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