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Planck on the entropy of light
While reminiscing of his discovery of the quantum of action Planck writes in his "Scientific Autobiography" [1]:
Thus the nature of entropy as a measure of probability, in the sense ...
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Light Polarizer and the Second Law of Thermodynamics
I have stumped myself with a thought experiment of my own devising.
Suppose I take a beam of wholly depolarised, but otherwise plane wave light. Its von Neumann entropy per photon is $\log(2)$ nats ...
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