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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Lasing process in a closed bipartite quantum system: a thermodynamical analysis.

G Waldherr1, G Mahler

  • 1Institute of Theoretical Physics I, University of Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany. gerald.waldherr@itp1.uni-stuttgart.de

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

This study explores quantum systems, showing that energy exchange is heat, even during lasing relaxation. The findings suggest limited value in mapping this to a thermodynamic heat engine.

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Area of Science:

  • Quantum physics
  • Thermodynamics
  • Quantum optics

Background:

  • Closed bipartite quantum systems often relax towards their smaller subsystem.
  • The Jaynes-Cummings interaction is a fundamental model in quantum optics.

Purpose of the Study:

  • Investigate relaxation dynamics in a specific quantum system.
  • Analyze the properties of the electromagnetic field mode during relaxation.
  • Explore the thermodynamic implications of energy exchange.

Main Methods:

  • Modeling a finite spin network coupled to a single electromagnetic field mode.
  • Utilizing quantum optical methods to examine field mode properties.
  • Performing thermodynamic analysis of the system's energy exchange.

Main Results:

  • The system exhibits lasing/nonlasing relaxation or energy backflow.
  • During lasing, the field mode enters a phase-diffused Glauber state with no optical coherence.
  • Thermodynamic analysis confirms that all exchanged energy is heat.

Conclusions:

  • The investigated quantum system's energy exchange is characterized as heat.
  • The observed lasing process results in a loss of optical coherence in the field mode.
  • Applying a thermodynamic heat engine model to this system has limited utility.