Photo-Carnot engine

Photo-Carnot engine

A Photo-Carnot engine is a Carnot cycle engine in which the working medium is a photon inside a cavity with perfectly reflecting walls. Radiation is the working fluid, and the piston is driven by radiation pressure.

A quantum Carnot engine is one in which the atoms in the heat bath are given a small bit of quantum coherence. The phase of the atomic coherence provides a new control parameter. [cite web
url=http://www.sciencemag.org/cgi/content/abstract/299/5608/862|title=Extracting Work from a Single Heat Bath via Vanishing Quantum Coherence -- Scully et al. 299 (5608): 862 -- Science|publisher=www.sciencemag.org|accessdate=2008-06-18]

The deep physics behind the second law of thermodynamics is not violated; nevertheless, the quantum Carnot engine has certain features that are not possible in a classical engine.

ee also

*Carnot heat engine
*Radiometer

Footnotes

Further reading

*cite journal|url=http://www.sciencemag.org/cgi/content/abstract/299/5608/862|title=Extracting Work from a Single Heat Bath via Vanishing Quantum Coherence|author=Marlan O. Scully, et al.|journal=Science|date=2003-02-07|volume=299|issue=5608|pages=862–864|doi=10.1126/science.1078955
*cite conference|url=http://adsabs.harvard.edu/abs/2002AIPC..643...92Z|title=The Photo-Carnot Cycle: The Preparation Energy for Atomic Coherence|author=Zubairy, M. Suhail|booktitle=QUANTUM LIMITS TO THE SECOND LAW: First International Conference on Quantum Limits to the Second Law. AIP Conference Proceedings|volume=643|pages=92–97|date=2002|doi=10.1063/1.1523787


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