The convex roof of the square root of the three-tangle is solved exactly for all GHZ-W mixtures of three qubits, using a new zero-state locking theorem.
Therefore, it is enough to perform the classification in a wedge of the Bloch sphere given by the azimuthal an- gleϕ∈[−π/3, π/3] only
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The exact convex roof for GHZ-W mixtures for three qubits and beyond
The convex roof of the square root of the three-tangle is solved exactly for all GHZ-W mixtures of three qubits, using a new zero-state locking theorem.