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We propose non-local current-based thermometry using quantum dots as a practical alternative to voltage-based methods. A triple quantum dot setup offers enhanced sensitivity and robustness for sub-Kelvin range thermometers.

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Area of Science:

  • Quantum Thermodynamics
  • Nanoscale Thermometry

Background:

  • Non-local thermoelectric voltage-based thermometry requires unrealistic asymmetric coupling.
  • Existing methods suffer from sensitivity dependence on measurement terminal temperature, leading to errors.

Purpose of the Study:

  • To propose a practical alternative using non-local current-based thermometry in a dual quantum dot setup.
  • To introduce a non-local triple quantum dot thermometer for enhanced sensitivity and robustness.
  • To address limitations of previous thermometry techniques for sub-Kelvin range applications.

Main Methods:

  • Investigated non-local current measurements in dual and triple quantum dot systems.
  • Analyzed sensitivity robustness against measurement terminal temperature fluctuations.
  • Explored suppression of thermometry-induced reservoir temperature drift.

Main Results:

  • Non-local current thermometry in a dual dot setup shows robustness to temperature fluctuations at high bias.
  • A triple quantum dot thermometer achieves enhanced sensitivity and bypasses unrealistic coupling requirements.
  • Fabrication variability in Coulomb coupling is overcome in the triple dot design.
  • Heat exchange with the target reservoir is significantly reduced in the triple dot setup.

Conclusions:

  • Non-local current-based thermometry offers a practical approach for quantum dot thermometers.
  • The proposed triple quantum dot thermometer provides superior performance and robustness.
  • This work paves the way for practical, high-performance sub-Kelvin range thermometers.