Supported in part by the National Natural Science Foundation of China under Grant No.19674013,and the Education Committee Foundation of Hu'nan Province under Grant No.98B028,and the Natural Science Foundation of Hu'nan Province under Grant No.97JJY2051.
We introduce entanglement measures to describe entanglement in a three-particle system and apply it to studying broadcasting of entanglement in the three-particle Greenberger-Horne-Zeilinger (GHZ) state. The results s...