Achieving sub-shot-noise sensing at finite temperatures
We investigate sensing of magnetic fields using quantum spin chains at finite temperature and exploit quantum phase crossovers to improve metrological bounds on the estimation of the chain parameters. In particular, we analyze the XX spin chain and show that the magnetic sensitivity of this system i...
| Main Authors: | , , |
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| Format: | Article |
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American Physical Society
2016
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| Online Access: | https://eprints.nottingham.ac.uk/46867/ |
| _version_ | 1848797415420723200 |
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| author | Mehboudi, Mohammad Correa, Luis A. Sanpera, Anna |
| author_facet | Mehboudi, Mohammad Correa, Luis A. Sanpera, Anna |
| author_sort | Mehboudi, Mohammad |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | We investigate sensing of magnetic fields using quantum spin chains at finite temperature and exploit quantum phase crossovers to improve metrological bounds on the estimation of the chain parameters. In particular, we analyze the XX spin chain and show that the magnetic sensitivity of this system is dictated by its adiabatic magnetic susceptibility, which scales extensively (linearly) in the number of spins N. Next, we introduce an iterative feedforward protocol that actively exploits features of quantum phase crossovers to enable super-extensive scaling of the magnetic sensitivity. Moreover, we provide experimentally realistic observables to saturate the quantum metrological bounds. Finally, we also address magnetic sensing in the Heisenberg XY spin chain. |
| first_indexed | 2025-11-14T20:03:31Z |
| format | Article |
| id | nottingham-46867 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T20:03:31Z |
| publishDate | 2016 |
| publisher | American Physical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-468672020-05-04T18:16:09Z https://eprints.nottingham.ac.uk/46867/ Achieving sub-shot-noise sensing at finite temperatures Mehboudi, Mohammad Correa, Luis A. Sanpera, Anna We investigate sensing of magnetic fields using quantum spin chains at finite temperature and exploit quantum phase crossovers to improve metrological bounds on the estimation of the chain parameters. In particular, we analyze the XX spin chain and show that the magnetic sensitivity of this system is dictated by its adiabatic magnetic susceptibility, which scales extensively (linearly) in the number of spins N. Next, we introduce an iterative feedforward protocol that actively exploits features of quantum phase crossovers to enable super-extensive scaling of the magnetic sensitivity. Moreover, we provide experimentally realistic observables to saturate the quantum metrological bounds. Finally, we also address magnetic sensing in the Heisenberg XY spin chain. American Physical Society 2016-10-21 Article PeerReviewed Mehboudi, Mohammad, Correa, Luis A. and Sanpera, Anna (2016) Achieving sub-shot-noise sensing at finite temperatures. Physical Review A, 94 (4). 042121/1-042121/7. ISSN 2469-9934 https://link.aps.org/doi/10.1103/PhysRevA.94.042121 doi:10.1103/PhysRevA.94.042121 doi:10.1103/PhysRevA.94.042121 |
| spellingShingle | Mehboudi, Mohammad Correa, Luis A. Sanpera, Anna Achieving sub-shot-noise sensing at finite temperatures |
| title | Achieving sub-shot-noise sensing at finite temperatures |
| title_full | Achieving sub-shot-noise sensing at finite temperatures |
| title_fullStr | Achieving sub-shot-noise sensing at finite temperatures |
| title_full_unstemmed | Achieving sub-shot-noise sensing at finite temperatures |
| title_short | Achieving sub-shot-noise sensing at finite temperatures |
| title_sort | achieving sub-shot-noise sensing at finite temperatures |
| url | https://eprints.nottingham.ac.uk/46867/ https://eprints.nottingham.ac.uk/46867/ https://eprints.nottingham.ac.uk/46867/ |