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Quantum Simulation of Single-Qubit Thermometry Using Linear Optics.

Luca Mancino1, Marco Sbroscia1, Ilaria Gianani1

  • 1Dipartimento di Scienze, Università degli Studi Roma Tre, Via della Vasca Navale 84, 00146 Rome, Italy.

Physical Review Letters
|April 15, 2017
PubMed
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This study explores using quantum coherence in single-qubit thermometers operating out of equilibrium. Results show coherence significantly impacts thermalization, influencing thermometer accuracy and usefulness.

Area of Science:

  • Quantum physics
  • Quantum information science
  • Thermodynamics

Background:

  • Standard thermometry relies on probe thermalization.
  • Quantum systems offer new possibilities for thermometry using non-equilibrium states and coherence.

Purpose of the Study:

  • To investigate the role of quantum coherence in a single-qubit thermometer operating out of equilibrium.
  • To analyze how coherence affects the thermometer's performance and the utility of non-equilibrium conditions.

Main Methods:

  • Simulating qubit-environment interactions within a linear-optical device.
  • Analyzing the impact of coherence on thermalization propensity.
  • Utilizing the availability function to understand observed behaviors.

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Main Results:

  • Quantum coherence significantly influences the thermalization process of a single-qubit thermometer.
  • Non-equilibrium conditions can be useful for thermometry, but their effectiveness is modulated by coherence.
  • The availability function provides insight into how coherence affects the thermometer's response.

Conclusions:

  • Quantum coherence is a critical factor in the performance of non-equilibrium single-qubit thermometers.
  • Understanding coherence-dependent thermalization is key to optimizing quantum thermometry.
  • This work advances the application of quantum phenomena for precise temperature measurements.