Physical Review Research (Sep 2020)

Nonequilibrium readiness and precision of Gaussian quantum thermometers

  • Luca Mancino,
  • Marco G. Genoni,
  • Marco Barbieri,
  • Mauro Paternostro

DOI
https://doi.org/10.1103/PhysRevResearch.2.033498
Journal volume & issue
Vol. 2, no. 3
p. 033498

Abstract

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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.