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IBM Journal of Research and Development  
Volume 32, Number 1, Page 29 (1988)
Basic Concepts in Quantum and Stochastic T...
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Information transport obeying the continuity equation

by T. Toffoli
We analyze nontrivial dynamical systems in which information flows as an additive conserved quantity—and thus takes on a strikingly tangible aspect. To arrive at this result, we first give an explicit characterization of equilibria for a family of lattice gases.
Related Subjects: Communication theory