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Equivalence between Two-Qubit Entanglement and Secure Key Distribution
Physical Review Letters
We study the problem of secret key distillation from bipartite states in the scenario where Alice and Bob can only perform measurements at the single-copy level and classically process the obtained outcomes. Even with these limitations, secret bits can be asymptotically distilled by the honest parties from any two-qubit entangled state, under any individual attack. Our results point out a complete equivalence between two-qubit entanglement and secure key distribution: a key can be establisheddoi:10.1103/physrevlett.91.167901 pmid:14611441 fatcat:ihc4yvlpivd4pevx6t276komuq