Quantum Networks is focused on density matrix theory cast into a representation - SU(n) algebra - particularly adapted to describing networks of quasi-molecular subsystems. This approach is important for understanding how classical properties emerge within a quantum mechanical world and how non-classical features survive in a classical environment. Non-classical aspects such as single-particle and multi-particle coherence are introduced and discussed. A picture evolves of how these features are generated and destroyed by interactions with the environment. The outcome is a description of how the dynamics of individual quantum sytems are interrelated with information dynamics. This book will be invaluable for graduates and scientists with a theoretical interest in quantum systems. It will help them develop an intuitive feeling for the meaning of quantum information and how its rules depend on the environment.