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A heat engine is a device used to extract heat from a source and then convert it into mechanical work used for various applications. For example, a steam engine on an old-style train can produce the work needed for driving the train.
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Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Strongly Coupled Quantum Heat Machines.

David Gelbwaser-Klimovsky1, Alán Aspuru-Guzik1

  • 1Department of Chemistry and Chemical Biology, Harvard University , Cambridge, Massachusetts 02138, United States.

The Journal of Physical Chemistry Letters
|August 21, 2015
PubMed
Summary

Quantum heat machines operating at strong coupling can be as efficient as those at weak coupling. However, their output saturates and disappears in the ultrastrong coupling regime.

Keywords:
Energy conversionOpen quantum systemsPolaron transformationQuantum heat machinesStrong coupling

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Area of Science:

  • Quantum thermodynamics
  • Quantum heat machines
  • Quantum information science

Background:

  • Quantum heat machines (QHMs) model heat-to-work energy conversion at the quantum level.
  • Standard QHMs assume weak coupling to thermal baths, limiting output by coupling strength.

Purpose of the Study:

  • To explore QHMs in the strong coupling regime, where standard assumptions may not apply.
  • To investigate the efficiency and output behavior of QHMs beyond the weak coupling limit.

Main Methods:

  • Analysis of quantum heat machines in the strong coupling regime.
  • Investigating the breakdown of the separability principle and standard thermodynamic assumptions.

Main Results:

  • Strongly coupled QHMs can achieve efficiencies comparable to weakly coupled ones.
  • A novel turnover behavior is observed, where output saturates and vanishes at ultrastrong coupling.

Conclusions:

  • Strong coupling offers a viable regime for quantum heat machine operation without sacrificing efficiency.
  • The ultrastrong coupling regime presents unique limitations and phenomena for QHMs.