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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.03821 |
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| _version_ | 1866911361997471744 |
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| author | Tong, Xiaowei Qiu, Xingze Zhan, Xiang Lin, Quan Wang, Kunkun Nori, Franco Xue, Peng |
| author_facet | Tong, Xiaowei Qiu, Xingze Zhan, Xiang Lin, Quan Wang, Kunkun Nori, Franco Xue, Peng |
| contents | Topological quantum sensing leverages unique topological features to suppress noise and improve the precision of parameter estimation, emerging as a promising tool in both fundamental research and practical application. In this Letter, we propose a sensing protocol that exploits the dynamics of topological quantum walks incorporating localized defects. Unlike conventional schemes that rely on topological protection to suppress disorder and defects, our protocol harnesses the evolution time as a resource to enable precise estimation of the defect parameter. By utilizing topologically nontrivial properties of the quantum walks, the sensing precision can approach the Heisenberg limit. We further demonstrate the performance and robustness of the protocol through Bayesian estimation. Our results show that this approach maintains high precision over a broad range of parameters and exhibits strong robustness against disorder, offering a practical pathway for topologically enhanced quantum metrology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_03821 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Topological Sensing in the Dynamics of Quantum Walks with Defects Tong, Xiaowei Qiu, Xingze Zhan, Xiang Lin, Quan Wang, Kunkun Nori, Franco Xue, Peng Quantum Physics Mesoscale and Nanoscale Physics Topological quantum sensing leverages unique topological features to suppress noise and improve the precision of parameter estimation, emerging as a promising tool in both fundamental research and practical application. In this Letter, we propose a sensing protocol that exploits the dynamics of topological quantum walks incorporating localized defects. Unlike conventional schemes that rely on topological protection to suppress disorder and defects, our protocol harnesses the evolution time as a resource to enable precise estimation of the defect parameter. By utilizing topologically nontrivial properties of the quantum walks, the sensing precision can approach the Heisenberg limit. We further demonstrate the performance and robustness of the protocol through Bayesian estimation. Our results show that this approach maintains high precision over a broad range of parameters and exhibits strong robustness against disorder, offering a practical pathway for topologically enhanced quantum metrology. |
| title | Topological Sensing in the Dynamics of Quantum Walks with Defects |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2601.03821 |