Entanglement of three-qubit pure states in terms of teleportation   capability
  We define an entanglement measure, called the partial tangle, which represents the residual two-qubit entanglement of a three-qubit pure state. By its explicit calculations for three-qubit pure states, we show that the partial tangle is closely related to the faithfulness of a teleportation scheme over a three-qubit pure state. 
Soojoon Lee, Jaewoo Joo, and Jaewan Kim