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\begin{itemize}  \item \citet{2010arXiv1004.4732O} suggests that the minimum energy to (reversibly) copy one bit of information is $\ln4/\beta$. Uses a quantum system, and assumes low signal-to-noise.  \item \citet{Bennett_2003} -- reversible computation, Landauer  \item \citat{10.1016/S0378-4371(98)00513-5} \citet{10.1016/S0378-4371(98)00513-5}  Information as physical entity \end{itemize}  {\bf Foundations}