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
Tian Chen (chentian@bit.edu.cn)
Xiangdong Zhang (zhangxd@bit.edu.cn)
Published:31 August 2024,
Published Online:16 July 2024,
Received:08 January 2024,
Revised:25 June 2024,
Accepted:26 June 2024
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Tang, Z. et al. Topologically protected entanglement switching around exceptional points.,Light: Science & Applications, 13, 1631-1644 (2024).
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.
The robust operation of quantum entanglement states is crucial for applications in quantum information
computing
and communications
1
1
–
3
3
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.
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