Entanglement of formation and concurrence

By W. Wootters. Quantum information & computation, 2001

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Geometry of Quantum States: Index (2007, methodology): “For instance, the convex roof extended negativity [582] and concurrence of formation [982, 783, 663] are related to E1/2 and E2, respectively.”
Entanglement in many-body systems (2007, methodology): “…measures can be found in (Bengtsson and Zyczkowski, 2006; Bruß, 2002; Eisert, 2006; Horodecki et al., 2007; Plenio and Vedral, 1998; Plenio and Virmani, 2007; Vedral, 2002; Wootters, 2001) In this context, we also outline a method of detecting entanglement, based on entanglement witnesses.”
The Laplacian of a Graph as a Density Matrix: A Basic Combinatorial Approach to Separability of Mixed States (2004, background): “The notion of concurrence was introduced by Wootters [12].”
Measures and dynamics of entangled states (2005, neutral): “For Θ = σy ⊗ σy C∗ [49,66], with the second Pauli matrix σy and C∗ the complex conjugation in the standard basis (defined after Eq.”