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A measure for genuine tripartite entanglement
We introduce a real-valued functional $I(\vec{n}_1,\vec{n}_2)$ of four three-qubit correlation expectation values that turns the Greenberger--Horne--Zeilinger (GHZ) algebraic paradox into a quantitative witness of genuine tripartite entanglement. We prove that $|I(\vec{n}_1,\vec{n}_2;ρ)|\le 2$ for a
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