Nonequilibrium quantum thermometry with noncommutative system-bath couplings
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911332852301824 |
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| author | Aiache, Youssef Allati, Abderrahim El Demir, İlkay Anouz, Khadija El |
| author_facet | Aiache, Youssef Allati, Abderrahim El Demir, İlkay Anouz, Khadija El |
| contents | Accurate temperature estimation in the quantum and cryogenic regimes remains a fundamental challenge. Here, we investigate nonequilibrium quantum thermometry using a single-qubit probe coupled to a bosonic bath through noncommuting interaction operators, which unify pure dephasing and dissipative dynamics within a spin-boson model. We show that the interference between these two coupling channels induces strong non-Markovian feedback between populations and coherences, leading to coherence trapping and enhanced thermal sensitivity. Remarkably, by tuning the coupling structure, the probe's temperature sensitivity exhibits a quadratic low-temperature scaling, even under weak coupling. Moreover, while coherence-based measurements are formally suboptimal, they become the most informative in the early nonequilibrium regime, where memory effects dominate. Our findings identify noncommutative system-bath couplings as a practical and tunable resource for achieving high-precision quantum thermometry in realistic open-system architectures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_19607 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Nonequilibrium quantum thermometry with noncommutative system-bath couplings Aiache, Youssef Allati, Abderrahim El Demir, İlkay Anouz, Khadija El Quantum Physics Accurate temperature estimation in the quantum and cryogenic regimes remains a fundamental challenge. Here, we investigate nonequilibrium quantum thermometry using a single-qubit probe coupled to a bosonic bath through noncommuting interaction operators, which unify pure dephasing and dissipative dynamics within a spin-boson model. We show that the interference between these two coupling channels induces strong non-Markovian feedback between populations and coherences, leading to coherence trapping and enhanced thermal sensitivity. Remarkably, by tuning the coupling structure, the probe's temperature sensitivity exhibits a quadratic low-temperature scaling, even under weak coupling. Moreover, while coherence-based measurements are formally suboptimal, they become the most informative in the early nonequilibrium regime, where memory effects dominate. Our findings identify noncommutative system-bath couplings as a practical and tunable resource for achieving high-precision quantum thermometry in realistic open-system architectures. |
| title | Nonequilibrium quantum thermometry with noncommutative system-bath couplings |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2512.19607 |