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Non-local triple quantum dot thermometer based on Coulomb-coupled systems.
Suraj G Dhongade1, Afreen A Haque1, Sayan Saha Roy1
1Department of Electronics and Electrical Communication Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
Scientific Reports
|September 23, 2022
Summary
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.
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.
