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Three-level laser heat engine at optimal performance with ecological function.

Varinder Singh1, Ramandeep S Johal1

  • 1Department of Physical Sciences, and Indian Institute of Science Education and Research Mohali, Sector 81, S.A.S. Nagar, Manauli P. O. 140306, Punjab, India.

Physical Review. E
|September 11, 2019
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Summary
This summary is machine-generated.

This study explores a three-level laser quantum heat engine optimized for ecological function (EF). Operating at maximum EF offers a balance between power output and entropy production, showing environmental relevance.

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Area of Science:

  • Quantum Thermodynamics
  • Laser Physics
  • Statistical Mechanics

Background:

  • Classical and quantum heat engines exhibit surprising similarities in optimal efficiency.
  • Ecological function (EF) balances power output with entropy production losses.
  • Laser systems can function as quantum heat engines.

Purpose of the Study:

  • Investigate a three-level laser quantum heat engine operating at maximum ecological function (EF).
  • Analyze global and local optimization strategies for the laser engine.
  • Derive analytic expressions for engine efficiency under various conditions.

Main Methods:

  • Numerical and analytical approaches to study engine performance.
  • Mapping the quantum engine to classical models like Feynman's ratchet and pawl.
  • Derivation of efficiency bounds under strong coupling and high bath temperatures.

Main Results:

  • In low-temperature regimes, the laser engine behavior mirrors classical models.
  • Analytic efficiency expressions derived for strong matter-field coupling and high bath temperatures.
  • Established upper and lower bounds on efficiency for asymmetric dissipation scenarios.
  • Derived new efficiency bounds for weak/intermediate coupling in the high-temperature limit.

Conclusions:

  • Maximum EF operation yields low fractional power loss while maintaining significant power output (at least 75% of maximum).
  • The ecological function is a relevant objective for environmentally conscious engine design.
  • Quantum heat engines, like the studied laser system, can exhibit classical thermodynamic behaviors and bounds.