Probabilistic quantum cloning via Greenberger-Horne-Zeilinger states
  We propose a probabilistic quantum cloning scheme using Greenberger-Horne-Zeilinger states, Bell basis measurements, single-qubit unitary operations and generalized measurements, all of which are within the reach of current technology. Compared to another possible scheme via Tele-CNOT gate [D. Gottesman and I. L. Chuang, Nature 402, 390 (1999)], the present scheme may be used in experiment to clone the states of one particle to those of two different particles with higher probability and less GHZ resources. 
Chuan-Wei Zhang, Chuan-Feng Li, Zi-Yang Wang, and Guang-Can Guo   (University of Science and Technology of China)