Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficiency at Maximum Power of Laser Quantum Heat Engine Enhanced by
  Noise-Induced Coherence   Quantum coherence has been demonstrated in various systems including organic
solar cells and solid state devices. In this letter, we report the lower and
upper bounds for the performance of quantum heat engines determined by the
efficiency at maximum power. Our prediction based on the canonical 3-level
Scovil and Schulz-Dubois maser model strongly depends on the ratio of
system-bath couplings for the hot and cold baths and recovers the theoretical
bounds established previously for the Carnot engine. Further, introducing a
4-th level to the maser model can enhance the maximal power and its efficiency,
thus demonstrating the importance of quantum coherence in the thermodynamics
and operation of the heat engines beyond the classical limit.

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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci