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Simulating and Optimising Quantum Thermometry Using Single Photons.

W K Tham1, H Ferretti1, A V Sadashivan1

  • 1Centre for Quantum Information &Quantum Control and Institute for Optical Sciences, Department of Physics, University of Toronto, 60 St. George St, Toronto, Ontario, M5S 1A7, Canada.

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This summary is machine-generated.

Quantum coherence enhances the sensitivity of quantum thermometers, improving temperature discrimination at finite times. This study explores optimal states and interaction times for single-photon and multi-qubit thermometers.

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Area of Science:

  • Quantum physics
  • Thermodynamics
  • Quantum information science

Background:

  • Classical thermometers reach equilibrium for measurement.
  • Quantum thermometers, particularly single qubits, show improved temperature discrimination at finite times.
  • Quantum coherence enhances qubit thermometer sensitivity.

Purpose of the Study:

  • To investigate optimal quantum states and interaction times for single-qubit thermometers.
  • To explore the performance of multi-qubit thermometers using an adaptive protocol.
  • To confirm the benefits of quantum coherence in temperature discrimination.

Main Methods:

  • Emulating quantum channels to model single-photon thermometers.
  • Simulating qubit thermometers interacting with a thermal bath.
  • Analyzing thermometer performance based on temperature discrimination and sensitivity.

Main Results:

  • Quantum coherence significantly improves temperature discrimination for qubit thermometers.
  • Optimal finite interaction times exist for enhanced sensitivity.
  • An adaptive protocol effectively utilizes multiple qubits for thermometry.

Conclusions:

  • Quantum coherence is crucial for high-sensitivity quantum thermometry.
  • Finite-time measurements and multi-qubit strategies offer practical advantages.
  • Photon polarization provides a viable platform for quantum thermometry.