Quantum Thermometry of External Phonon Reservoirs in Driven Open Quantum Systems

Quantum Physics [Submitted on 16 Apr 2026] Quantum Thermometry of External Phonon Reservoirs in Driven Open Quantum Systems Yildiz Berk Ates We investigate the non-monotonic temperature sensitivity of a coherently driven two-level quantum system coupled to an Ohmic phonon environment. By employing a unitary polaron transformation, we account for phonon-induced renormalization effects that go beyond the standard weak-coupling approximations. Our analysis reveals that the Quantum Fisher Information (QFI) exhibits a prominent peak at an intermediate system-environment coupling strength, identifying an optimal regime for thermal sensing. This behavior emerges from a fundamental competition between environment-induced dissipation enhancement and the exponential suppression of system parameters due to phonon dressing. We demonstrate that while thermometric precision vanishes in both the ultra-weak and strong coupling limits, a properly tuned nonequilibrium steady state can significantly enhance sensitivity. These results suggest that environmental interactions, often viewed as detrimental decoherence sources, can be engineered as a resource to optimize the performance of solid-state quantum thermometers. Comments: 12 pages , 4 figures Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.14855 [quant-ph]   (or arXiv:2604.14855v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2604.14855 Focus to learn more Submission history From: Yildiz Berk Ates [view email] [v1] Thu, 16 Apr 2026 10:42:27 UTC (519 KB) Access Paper: HTML (experimental) view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-04 References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)