M. Yang, A. Delgado, L. Roa and C. Saavedra
OPTICS COMMUNICATION 282, 7 (2009)
Entanglement concentration for higher dimensional quantum systems, qudits, is studied. in particular, we study a concentration protocol based on entanglement swapping of non-maximally entangled qudits via quantum state discrimination. We compare this protocol to a concentration scheme based on copies of the state to be concentrated, local transformations and two-way communications. We show that the success probability of the first scheme is equal to or larger than the success probability of the latter. (C) 2008 Elsevier B.V. All rights reserved.