I. Ghiu et al., Entanglement-assisted local transformations between inequivalent classes of three-particle entangled states, PHYS LETT A, 287(1-2), 2001, pp. 12-18
We show that bipartite and tripartite entangled states cannot be used as ca
talysis states to enable local transformations inbetween inequivalent class
es of three-particle entangled states which are non-interchangeable under l
ocal transformations. We find the optimal protocol for conversion of a cert
ain family of the W-states and an EPR-pair into the GHZ-state. (C) 2001 Els
evier Science B.V. All fights reserved.