%0 Journal Article
%T Quantum Data Processing
%A Rudolf Ahlswede
%A Peter Loeber
%J Physics
%D 1999
%I arXiv
%X We prove a data processing inequality for quantum communication channels, which states that processing a received quantum state may never increase the mutual information between input and output states.
%U http://arxiv.org/abs/quant-ph/9907081v1