Characterization of entanglement of more than two qubits with Bell inequalities and global entanglement
Jochen Endrejat, H. Büttner · Physical Review A · 2005
It is shown that the entanglement-structure of 3- and $4\text{\ensuremath{-}}\text{qubit}$ states can be characterized by optimized operators of the Mermin-Klyshko type. It is possible to discriminate between pure $2\text{\ensuremath{-}}\text{qubit}$ entanglements and higher entanglements. A comparison with a global entanglement measure is made.