Implementation and topological characterization of Weyl exceptional rings in quantum-mechanical systems
Fuente:
arXiv
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| Autores principales: | , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866911096768561152 |
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| author | Zhang, Hao-Long Han, Pei-Rong Yu, Xue-Jia Yang, Shou-Bang Lü, Jia-Hao Ning, Wen Wu, Fan Su, Qi-Ping Yang, Chui-Ping Yang, Zhen-Biao Zheng, Shi-Biao |
| author_facet | Zhang, Hao-Long Han, Pei-Rong Yu, Xue-Jia Yang, Shou-Bang Lü, Jia-Hao Ning, Wen Wu, Fan Su, Qi-Ping Yang, Chui-Ping Yang, Zhen-Biao Zheng, Shi-Biao |
| contents | Non-Hermiticity can lead to the emergence of many intriguing phenomena that are absent in Hermitian systems, enabled by exceptional topological defects, among which Weyl exceptional rings (WER) are particularly interesting. The topology of a WER can be characterized by the quantized Berry phase and a nonzero Chern number, both encoded in the eigenvectors of the non-Hermitian Hamiltonian. So far, WERs have been realized with classical wave systems, whose eigenvectors can be well described by classical physics. We here report the first quantum-mechanical implementation of WERs and investigate the related topology transitions. The experiment system consists of a superconducting qubit and a dissipative resonator, coupled to each other. The high flexibility of the system enables us to characterize its eigenvectors on different manifolds of parameter space, each of which corresponds to a quantum-mechanical entangled state. We extract both the quantized Berry phase and Chern number from these eigenvectors, and demonstrate the topological transition triggered by shrinking the size of the manifold. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_00903 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Implementation and topological characterization of Weyl exceptional rings in quantum-mechanical systems Zhang, Hao-Long Han, Pei-Rong Yu, Xue-Jia Yang, Shou-Bang Lü, Jia-Hao Ning, Wen Wu, Fan Su, Qi-Ping Yang, Chui-Ping Yang, Zhen-Biao Zheng, Shi-Biao Quantum Physics Non-Hermiticity can lead to the emergence of many intriguing phenomena that are absent in Hermitian systems, enabled by exceptional topological defects, among which Weyl exceptional rings (WER) are particularly interesting. The topology of a WER can be characterized by the quantized Berry phase and a nonzero Chern number, both encoded in the eigenvectors of the non-Hermitian Hamiltonian. So far, WERs have been realized with classical wave systems, whose eigenvectors can be well described by classical physics. We here report the first quantum-mechanical implementation of WERs and investigate the related topology transitions. The experiment system consists of a superconducting qubit and a dissipative resonator, coupled to each other. The high flexibility of the system enables us to characterize its eigenvectors on different manifolds of parameter space, each of which corresponds to a quantum-mechanical entangled state. We extract both the quantized Berry phase and Chern number from these eigenvectors, and demonstrate the topological transition triggered by shrinking the size of the manifold. |
| title | Implementation and topological characterization of Weyl exceptional rings in quantum-mechanical systems |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2407.00903 |