Werner states ρ_α are two-copy distillable if and only if α < −1/2, via a sharp dimension-free rank-two partial-trace inequality.
Costa Rico,New partial trace inequalities and distillability of Werner states, Lett
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Two-copy nondistillability of Werner states: sharp partial-trace inequalities and finite-copy extensions
Werner states ρ_α are two-copy distillable if and only if α < −1/2, via a sharp dimension-free rank-two partial-trace inequality.