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Fabrication and Testing of Photonic Thermometers
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Collisional Quantum Thermometry.

Stella Seah1,2, Stefan Nimmrichter3, Daniel Grimmer4,5

  • 1Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543.

Physical Review Letters
|November 26, 2019
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Summary
This summary is machine-generated.

We present a new quantum thermometry framework using collisional models. Our method generates correlated ancillas, outperforming standard bounds even with weak interactions.

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Area of Science:

  • Quantum physics
  • Thermodynamics
  • Metrology

Background:

  • Quantum thermometry aims to measure temperature with high precision.
  • Existing methods face limitations, especially with weak interactions.

Purpose of the Study:

  • Introduce a general framework for quantum thermometry using collisional models.
  • Explore the potential for enhanced precision through correlated ancillas.

Main Methods:

  • Utilize collisional models with intermediary systems to generate correlated ancillas.
  • Apply parameter estimation theory and analyze a minimal qubit model.
  • Investigate both individual and collective measurements of ancillas.

Main Results:

  • Demonstrate that individual ancillas can surpass the thermal Cramer-Rao bound.
  • Show superlinear scaling of Fisher information for collective measurements.
  • Highlight the advantage for weak system-ancilla interactions.

Conclusions:

  • The proposed framework offers a novel approach to quantum thermometry.
  • Sequential interactions and correlated ancillas provide significant metrological advantages.
  • This work may drive future advancements in precise temperature measurements.