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Stochastic Collisional Quantum Thermometry.

Eoin O'Connor1,2, Bassano Vacchini3,4, Steve Campbell1,2

  • 1School of Physics, University College Dublin, Belfield, D04 V1W8 Dublin, Ireland.

Entropy (Basel, Switzerland)
|December 24, 2021
PubMed
Summary
This summary is machine-generated.

Introducing random waiting times in quantum thermometry significantly broadens the parameter range for achieving quantum advantages. This enhancement, using the Weibull distribution, applies to various interactions and doesn

Keywords:
collision modelsopen quantum systemsquantum thermometry

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Area of Science:

  • Quantum physics
  • Quantum information science
  • Metrology

Background:

  • Collisional quantum thermometry utilizes particle interactions to measure temperature.
  • Existing schemes are sensitive to the timing of these collisions.
  • Extending the operational range of quantum thermometry is crucial for practical applications.

Purpose of the Study:

  • To investigate the impact of stochastic waiting times on quantum thermometry.
  • To determine if randomness can enhance the performance of collisional quantum thermometers.
  • To explore the role of quantum correlations in achieving enhanced thermometry.

Main Methods:

  • Developing a theoretical framework for collisional quantum thermometry with stochastic waiting times.
  • Analyzing the system's sensitivity using the Fisher information, comparing quantum and thermal limits.
  • Investigating specific interaction models, including dephasing and partial swap interactions.
  • Examining the necessity of local versus entangled measurements for performance enhancement.

Main Results:

  • Introducing stochasticity via the Weibull distribution significantly extends the parameter range for quantum advantage.
  • The enhancement is demonstrated for both dephasing and partial swap interactions.
  • Optimal measurements can be performed locally, indicating quantum correlations are not essential for this advantage.
  • Analysis of the deterministic model confirms the role of stochasticity.

Conclusions:

  • Stochasticity in waiting times is a viable strategy to improve quantum thermometry.
  • The Weibull distribution offers a robust method for introducing beneficial randomness.
  • Quantum advantage in this context does not rely on genuine quantum correlations.
  • The findings pave the way for more robust and widely applicable quantum thermometers.