For rank-2 mixtures of GHZ and W states, the convex-roof concurrence fill is exactly (5λ² - 4λ + 8)/9, derived through a new prism visualization of pure-state decompositions.
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From triangles to prisms: towards a geometric extension of concurrence fill for three-qubit mixed states
For rank-2 mixtures of GHZ and W states, the convex-roof concurrence fill is exactly (5λ² - 4λ + 8)/9, derived through a new prism visualization of pure-state decompositions.