Werner states ρ(d,α) are two-copy undistillable exactly when α≥−1/2, so ρ(4,−1/2) is not two-copy distillable.
Sets of Complex Numbers Associated with a Matrix,
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On the two-copy distillability of Werner states and a new partial trace inequality
Werner states ρ(d,α) are two-copy undistillable exactly when α≥−1/2, so ρ(4,−1/2) is not two-copy distillable.