Nonequilibrium quantum thermometry with noncommutative system-bath couplings

• URL: http://arxiv.org/abs/2512.19607v1
• Date: Mon, 22 Dec 2025 17:44:16 GMT
• Title: Nonequilibrium quantum thermometry with noncommutative system-bath couplings
• Authors: Youssef Aiache, Abderrahim El Allati, İlkay Demir, Khadija El Anouz,
• Abstract summary: We investigate nonequilibrium quantum thermometry using a single-qubit probe coupled to a bosonic bath.<n>By tuning the coupling structure, the probe's temperature sensitivity exhibits a quadratic low-temperature scaling.<n>Our findings identify noncommutative system-bath couplings as a practical and tunable resource for achieving high-precision quantum thermometry.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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.

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