Entanglement classification of four-partite states under the SLOCC
S. M. Zangi, Junli Li, Cong‐Feng Qiao · Journal of Physics A Mathematical and Theoretical · 2017
Abstract We present a practical classification scheme for the four-partite entangled states under stochastic local operations and classical communication (SLOCC). By transforming a four-partite state into a triple-state set composed of two tripartite states and a bipartite state, the entanglement classification is reduced to the classification of tripartite and bipartite entanglements. This reduction method has the merit of involving only the linear constrains, and meanwhile provides an insight into the entanglement character of the subsystems.