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Nonequilibrium readiness and precision of Gaussian quantum thermometers

Luca Mancino1, Marco G. Genoni2, Marco Barbieri3,4, and Mauro Paternostro1

  • 1Centre for Theoretical Atomic, Molecular and Optical Physics, School of Mathematics and Physics, Queen's University, Belfast BT7 1NN, United Kingdom
  • 2Quantum Technology Lab, Dipartimento di Fisica, Università degli Studi di Milano, 20133 Milano, Italy
  • 3Dipartimento di Scienze, Università degli Studi Roma Tre, Via della Vasca Navale 84, 00146 Rome, Italy
  • 4Istituto Nazionale di Ottica, CNR-INO, 50125 Florence, Italy

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Phys. Rev. Research 2, 033498 – Published 25 September, 2020

DOI: https://doi.org/10.1103/PhysRevResearch.2.033498

Abstract

The dimensionality of a thermometer is key in the design of quantum thermometry schemes. In general, the phenomenology that is typical of qubit-based quantum thermometry does not apply to infinite-dimensional ones. We analyze the dynamical and metrological features of nonequilibrium Gaussian quantum thermometers: On one hand, we highlight how quantum entanglement can enhance the readiness of composite Gaussian thermometers; on the other hand, we show that nonequilibrium conditions do not guarantee the best sensitivities in temperature estimation, thus suggesting the reassessment of some of the working principles underpinning quantum thermometry.

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See Also

Discrimination of thermal baths by single-qubit probes

Ilaria Gianani, Donato Farina, Marco Barbieri, Valeria Cimini, Vasco Cavina, and Vittorio Giovannetti
Phys. Rev. Research 2, 033497 (2020)

Article Text

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Phys. Rev. Research 2, 033498– Published 25 September, 2020
  • Received 7 May 2020
  • Accepted 24 August 2020
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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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