Journal
PHYSICAL REVIEW LETTERS
Volume 87, Issue 27, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.87.277902
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More than two multipartite orthogonal states cannot always be discriminated if only local operations and classical communication (LOCC) are allowed. We show that four Bell states cannot be discriminated by LOCC, even probabilistically, using the separability properties of a four-party unlockable bound entangled state. Using an existing inequality among the measures of entanglement, we show that any three Bell states cannot be discriminated with certainty by LOCC. Exploiting the inequality, we calculate the distillable entanglement of a certain class of 4 circle times 4 mixed states.
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