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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2311.12756 |
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| _version_ | 1866917759443533824 |
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| author | Sarkar, Saubhik Ciccarello, Francesco Carollo, Angelo Bayat, Abolfazl |
| author_facet | Sarkar, Saubhik Ciccarello, Francesco Carollo, Angelo Bayat, Abolfazl |
| contents | Non-Hermitian physics predicts open quantum system dynamics with unique topological features such as exceptional points and the non-Hermitian skin effect. We show that this new paradigm of topological systems can serve as probes for bulk Hamiltonian parameters with quantum-enhanced sensitivity reaching Heisenberg scaling. Such enhancement occurs close to a spectral topological phase transition, where the entire spectrum undergoes a delocalization transition. We provide an explanation for this enhanced sensitivity based on the closing of point gap, which is a genuinely non-Hermitian energy gap with no Hermitian counterpart. This establishes a direct connection between energy-gap closing and quantum enhancement in the non-Hermitian realm. Our findings are demonstrated through several paradigmatic non-Hermitian topological models in various dimensions and potential experimental implementations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_12756 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Critical non-Hermitian topology induced quantum sensing Sarkar, Saubhik Ciccarello, Francesco Carollo, Angelo Bayat, Abolfazl Quantum Physics Non-Hermitian physics predicts open quantum system dynamics with unique topological features such as exceptional points and the non-Hermitian skin effect. We show that this new paradigm of topological systems can serve as probes for bulk Hamiltonian parameters with quantum-enhanced sensitivity reaching Heisenberg scaling. Such enhancement occurs close to a spectral topological phase transition, where the entire spectrum undergoes a delocalization transition. We provide an explanation for this enhanced sensitivity based on the closing of point gap, which is a genuinely non-Hermitian energy gap with no Hermitian counterpart. This establishes a direct connection between energy-gap closing and quantum enhancement in the non-Hermitian realm. Our findings are demonstrated through several paradigmatic non-Hermitian topological models in various dimensions and potential experimental implementations. |
| title | Critical non-Hermitian topology induced quantum sensing |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2311.12756 |