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Quantum Szilard engines with arbitrary spin.

Zekun Zhuang1, Shi-Dong Liang1

  • 1State Key Laboratory of Optoelectronic Material and Technology, and Guangdong Province Key Laboratory of Display Material and Technology, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 11, 2014
PubMed
Summary
This summary is machine-generated.

This study generalizes the quantum Szilard engine to arbitrary spin systems, revealing unique work extraction behaviors in fermion and boson models. Oscillating work absorption and particle-dependent phase transitions highlight complex quantum thermodynamic properties.

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Area of Science:

  • Quantum Thermodynamics
  • Information Physics
  • Statistical Mechanics

Background:

  • The quantum Szilard engine (QSZE) is a foundational model for exploring quantum thermodynamics and information physics.
  • Understanding quantum engines requires generalizing basic models to include more complex systems like those with spin.

Purpose of the Study:

  • To generalize the quantum Szilard engine to arbitrary spin systems, creating the spin QSZE (SQSZE).
  • To systematically investigate the thermodynamic properties of both fermion and boson SQSZEs.
  • To analyze work extraction, phase transitions, and information-work efficiency.

Main Methods:

  • Low-temperature approximation for analyzing SQSZE properties.
  • Analytic formulation of total work for fermion and boson systems.
  • Investigation of phase diagrams and critical temperatures.
  • Application of Landauer's erasure principle to define information-work efficiency.

Main Results:

  • Fermion SQSZEs exhibit periodic and oscillating work absorption, with average absorbed work behaving as neither intensive nor extensive.
  • Phase diagrams reveal distinct positive/negative work regions for fermion and boson SQSZEs due to spin's role.
  • Critical temperature is sensitive to particle number, and erasure work is calculated.

Conclusions:

  • The spin degree of freedom significantly impacts the thermodynamic behavior of quantum Szilard engines.
  • The study provides a framework for understanding information-to-work conversion in quantum systems.
  • Conditions for optimizing work extraction and efficiency in SQSZEs are identified.