Figure 9
From: Comparing bound entanglement of bell diagonal pairs of qutrits and ququarts
\((c_{0,0}, c_{1,0}, c_{2,1}, c_{2,2})\) for optimized separable states for \(d=4\), demonstrating necessity of full-line mixing for separability of states that concentrate most probability on 4 Bell states. Figure created with Ref.46.
