摘要
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 show that the entanglement of the three-qubit GHZ state can be partially broadcasted with the help of local or non-local copying processes. It is found that non-local cloning is much more efficient than local cloning for the broadcasting of entanglement.
基金
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.
