Shake before use: universal enhancement of quantum thermometry by unitary driving

• URL: http://arxiv.org/abs/2511.19631v2
• Date: Wed, 26 Nov 2025 18:59:31 GMT
• Title: Shake before use: universal enhancement of quantum thermometry by unitary driving
• Authors: Emanuele Tumbiolo, Lorenzo Maccone, Chiara Macchiavello, Matteo G. A. Paris, Giacomo Guarnieri,
• Abstract summary: This Letter establishes a general, model-independent result showing that any temperature-dependent unitary driving applied to a thermalized probe enhances its quantum Fisher information with respect to its equilibrium value.<n>Our results are benchmarked on a driven spin-$1/2$ thermometer, furthermore showing that resonant modulations remarkably restore the quadratic-in-time scaling of the Fisher information and allow to shift the sensitivity peak across arbitrary temperature ranges.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum thermometry aims at determining temperature with ultimate precision in the quantum regime. Standard equilibrium approaches, limited by the Quantum Fisher Information given by static energy fluctuations, lose sensitivity outside a fixed temperature window. Non-equilibrium strategies have therefore been recently proposed to overcome these limits, but their advantages are typically model-dependent or tailored for a specific purpose. This Letter establishes a general, model-independent result showing that any temperature-dependent unitary driving applied to a thermalized probe enhances its quantum Fisher information with respect to its equilibrium value. Such information gain is expressed analytically through a positive semi-definite kernel of information currents that quantify the flow of statistical distinguishability. Our results are benchmarked on a driven spin-$1/2$ thermometer, furthermore showing that resonant modulations remarkably restore the quadratic-in-time scaling of the Fisher information and allow to shift the sensitivity peak across arbitrary temperature ranges. Our findings identify external unitary control as a universal resource for precision metrology and pave the way for future implementations in quantum sensing.

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