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Autonomous quantum thermodynamic machines.

Friedemann Tonner1, Günter Mahler

  • 1Institute of Theoretical Physics 1, Universität Stuttgart, D-70550 Stuttgart, Germany. friedemann.tonner@itp1.uni-stuttgart.de

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 21, 2006
PubMed
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This study demonstrates a quantum system acting as a heat engine, amplifying oscillator motion via Carnot-type cycles. It reveals quantum and classical limits for this thermodynamic machine.

Area of Science:

  • Quantum thermodynamics
  • Quantum dynamics

Background:

  • Investigating quantum systems coupled to thermal baths is crucial for understanding energy transfer.
  • Exploring quantum devices as thermodynamic machines offers new avenues for energy manipulation.

Purpose of the Study:

  • To analyze the dynamics of a single spin coupled to an oscillator between two thermal baths.
  • To demonstrate the potential of this system to function as a thermodynamic machine operating with Carnot-type cycles.

Main Methods:

  • Utilizing a specifically designed Lindblad equation to model the quantum system's dynamics.
  • Analyzing the system's behavior under different temperature conditions for the thermal baths.

Main Results:

  • The quantum system successfully operates as a thermodynamic machine, exhibiting Carnot-type cycles.

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  • When functioning as a heat engine, the device amplifies the coherent motion of the oscillator.
  • The system possesses both quantum and classical limits, with a tendency towards stationary transport away from the classical limit.

    • Conclusions:

    • The designed quantum system can effectively function as a heat engine with Carnot-type cycles.
    • Coherent oscillator motion is a key feature amplified in the heat engine regime.
    • Understanding the quantum and classical limits is essential for characterizing this quantum thermodynamic machine.