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An Otto engine is a four-stroke engine that uses a mixture of gasoline and air as the working fuel. The fuel is injected into the cylinder, and the piston is moved completely down so that the cylinder is at maximum volume. By moving the piston up, adiabatic compression takes place. The spark plug ignites the gasoline-air mixture, and the burning fuel adds heat to the system at a constant volume. The heated mixture expands adiabatically and gets further cooled by exhausting heat, and this cyclic...
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Related Experiment Video

Updated: Jul 2, 2025

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Universal quantum Otto heat machine based on the Dicke model.

He-Guang Xu1, Jiasen Jin1, G D M Neto2

  • 1School of Physics, Dalian University of Technology, 116024 Dalian, China.

Physical Review. E
|February 17, 2024
PubMed
Summary

Researchers developed a universal quantum heat machine (UQHM) using qubits and a bosonic field. This quantum engine can act as an engine, refrigerator, heater, or accelerator, with performance enhanced near phase transitions.

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Area of Science:

  • Quantum thermodynamics
  • Quantum information science
  • Condensed matter physics

Background:

  • Quantum thermal machines offer novel ways to harness quantum phenomena for energy conversion.
  • The Dicke model describes interacting quantum systems, relevant for understanding collective effects.

Purpose of the Study:

  • To investigate the creation of a universal quantum heat machine (UQHM) using N qubits coupled to a bosonic field within the open Dicke model.
  • To analyze the machine's functionality as an engine, refrigerator, heater, or accelerator by controlling system parameters.

Main Methods:

  • Modeling a quantum Otto thermal machine with N qubits interacting with a bosonic field and a reservoir (open Dicke model).
  • Calculating heat and work exchanges considering atom number, coupling regimes, and reservoir temperature ratios.
  • Analyzing quantum features like entanglement and second-order correlation.

Main Results:

  • Demonstrated the UQHM's ability to function in multiple modes (engine, refrigerator, heater, accelerator).
  • Showed that quantum resources (entanglement, correlation) do not impact UQHM efficiency or performance.
  • Identified improved efficiency and performance near the critical value of the Dicke model's phase transition parameter.

Conclusions:

  • A universal quantum heat machine is achievable using the open Dicke model.
  • Quantum correlations do not enhance the performance of this specific UQHM.
  • Optimal performance is linked to the proximity of the system's phase transition.