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  • Open Access

Information flow-enhanced precision in collisional quantum thermometry

Taysa M. Mendonça1,2,*, Diogo O. Soares-Pinto1,†, and Mauro Paternostro3,2,‡

  • *Contact author: tmendonca@ifsc.usp.br
  • †Contact author: dosp@ifsc.usp.br
  • ‡Contact author: mauro.paternostro@unipa.it
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Phys. Rev. Research 7, 043203 – Published 21 November, 2025

DOI: https://doi.org/10.1103/ymjl-hpm4

Abstract

We describe and analyze a quantum thermometer based on a multilayered collisional model. We propose a qubit system whose architecture provides significant sensitivity even for short interaction times between the ancillae that compose the thermometer probe and the system to be probed. The assessment of the flow of information taking place within the layered thermometer and between system and thermometer reveals that the tuning of the mutual backflow of information has a positive influence on the precision of thermometry, and helps unveiling the information-theoretic mechanisms behind the working principles of the proposed architecture.

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Phys. Rev. Research 7, 043203– Published 21 November, 2025
  • Received 13 August 2024
  • Accepted 25 August 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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