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Updated: Sep 23, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Josephson quantum spin thermodynamics.

Subhajit Pal1, Colin Benjamin1

  • 1School of Physical Sciences, National Institute of Science Education & Research, An OCC of Homi Bhabha National Institute, Jatni-752050, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 13, 2022
PubMed
Summary
This summary is machine-generated.

A novel Josephson junction (JJ) loop functions as a versatile quantum heat engine or refrigerator. Its efficiency and performance surpass existing proposals, offering tunable operating modes for diverse applications.

Keywords:
+xLCJosephsonquantumspintanhthermodynamics

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Area of Science:

  • Quantum Thermodynamics
  • Condensed Matter Physics
  • Nanoscale Heat Transfer

Background:

  • Josephson junctions (JJ) are crucial in quantum devices.
  • Quantum heat engines and refrigerators are areas of active research.
  • Previous JJ-based devices have limitations in efficiency and tunability.

Purpose of the Study:

  • To investigate a 1D Josephson junction loop as a tunable quantum heat engine and refrigerator.
  • To analyze the device's performance and efficiency compared to existing proposals.
  • To explore the impact of spin-flipping and flux tuning on device operation.

Main Methods:

  • Theoretical modeling of a 1D Josephson junction loop coupled to thermal reservoirs.
  • Analysis of the device's thermodynamic cycles (engine, refrigerator, pump modes).
  • Investigation of the role of spin-flip scattering and enclosed magnetic flux.

Main Results:

  • The device operates as a heat engine, refrigerator, Joule pump, or cold pump.
  • Quantum heat engine efficiency exceeds recent JJ proposals.
  • Quantum refrigerator performance is significantly higher than prior JJ-based refrigerators.
  • Tunable operation between modes via reservoir temperatures or enclosed flux.
  • Spin-flip scattering allows mode tuning solely by flux, independent of reservoir temperatures.

Conclusions:

  • The proposed Josephson junction loop is a highly versatile quantum thermodynamic device.
  • Its superior efficiency and tunable operation offer significant advantages for applications.
  • The ability to switch modes using only magnetic flux is a key innovation.