Classification of quantum channels of information transfer

Abstract:
Classification of states of quantum channels of information transfer is built on the basis of unreducible representations of qbit state space group of symmetry and properties of density matrix spectrum. It is shown that the reason of state disentanglement can be in degeneration of non-zero density matrix eigenvalues. Among the states with non-degenerate density matrix disentangled states form two-dimensional surface of special states.