Extracting Work from a Single Heat Bath via Vanishing Quantum Coherence

@article{Scully2003ExtractingWF,
  title={Extracting Work from a Single Heat Bath via Vanishing Quantum Coherence},
  author={Marlan O. Scully and Muhammad Suhail Zubairy and Girish S. Agarwal and Herbert Walther},
  journal={Science},
  year={2003},
  volume={299},
  pages={862 - 864}
}
We present here a quantum Carnot engine in which the atoms in the heat bath are given a small bit of quantum coherence. The induced quantum coherence becomes vanishingly small in the high-temperature limit at which we operate and the heat bath is essentially thermal. However, the phase φ, associated with the atomic coherence, provides a new control parameter that can be varied to increase the temperature of the radiation field and to extract work from a single heat bath. The deep physics behind… 
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