Constantin V. Usenko
Published 2007-02-05Version 1
Problem of classification of all the set of entangled states is considered. Invariance of entangled states relative to transformations from a group of symmetry of qubit space leads to classification of all states of the system through irreducible representations from that group. Excess of entropy of a subsystem over entropy of the whole system indicates the presence of entaglement in the system.
Comments: Presented at the NATO ARW "Quantum Communication and Security", 10-13 September 2006, Gdansk, Poland
Classification of the Entangled States $2 \times M \times N$
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