Topologically protected entanglement switching around exceptional points

Zan Tang; Tian Chen; Xing Tang; Xiangdong Zhang

doi:10.1038/s41377-024-01514-1

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Topologically protected entanglement switching around exceptional points

Original Articles

- Topologically protected entanglement switching around exceptional points
- Light: Science & Applications Vol. 13, Issue 8, Pages: 1631-1644(2024)
- Affiliations：
  
  Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education, Beijing Key Laboratory of Nanophotonics & Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, 100081 Beijing, China
- Author bio：
  
  Tian Chen (chentian@bit.edu.cn)
  Xiangdong Zhang (zhangxd@bit.edu.cn)
- Funds：
- DOI：10.1038/s41377-024-01514-1
  CLC：
- Received：08 January 2024，
  
  Revised：25 June 2024，
  
  Accepted：2024-06-26，
  
  Published Online：16 July 2024，
  
  Published：31 August 2024
- Accepted：
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Tang, Z. et al. Topologically protected entanglement switching around exceptional points.,Light: Science & Applications, 13, 1631-1644 (2024).
DOI：

Tang, Z. et al. Topologically protected entanglement switching around exceptional points.,Light: Science & Applications, 13, 1631-1644 (2024). DOI： 10.1038/s41377-024-01514-1.

摘要

Abstract

The robust operation of quantum entanglement states is crucial for applications in quantum information

computing

and communications

–

1–3

. However

it has always been a great challenge to complete such a task because of decoherence and disorder. Here

we propose theoretically and demonstrate experimentally an effective scheme to realize robust operation of quantum entanglement states by designing quadruple degeneracy exceptional points. By encircling the exceptional points on two overlapping Riemann energy surfaces

we have realized a chiral switch for entangled states with high fidelity. Owing to the topological protection conferred by the Riemann surface structure

this switching of chirality exhibits strong robustness against perturbations in the encircling path. Furthermore

we have experimentally validated such a scheme on a quantum walk platform. Our work opens up a new way for the application of non-Hermitian physics in the field of quantum information.

关键词

Keywords

references

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