Takahiro Sagawa, Masahito Ueda
We establish two fundamental theorems for information exchanges between two nonequilibrium systems: the sum of the exchanged information and entropy production satisfies the fluctuation theorem and the second law of thermodynamics, and the sum is additive with respect to the number of information exchanges. The two theorems set the fundamental limit of energy dissipation during information exchanges. Our results apply not only to feedback-controlled processes and the conventional setup of Maxwell's demon, but to a much broader class of information processing in which subsystems exchange information several times.
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http://arxiv.org/abs/1206.2479
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