Abstract
Mutual convertibility of bound entangled states under local quantum operations and classical communication (LOCC) is studied. We focus on states associated with unextendible product bases (UPB) in a system of three qubits. A complete classification of such UPBs is suggested. We prove that for any pair of UPBs S and T the associated bound entangled states ρ S and ρ T cannot be converted to each other by LOCC, unless S and T coincide up to local unitaries. More specifically, there exists a finite precision ε (S,T) > 0 such that for any LOCC protocol mapping ρ S into a probabilistic ensemble (pα, ρα), the fidelity between ρ T and any possible final state ρα satisfies F(ρ T , ρα) = 1 - ε(S,T).
PACS: 03.65.Bz; 03.67.-a; 89.70+c.
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Bravyi, S.B. Unextendible Product Bases and Locally Unconvertible Bound Entangled States. Quantum Inf Process 3, 309–329 (2004). https://doi.org/10.1007/s11128-004-7076-z
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DOI: https://doi.org/10.1007/s11128-004-7076-z