Phys. Rev. Lett. 89, 027901 (2002) [4 pages]Entanglement Cost of Bipartite Mixed StatesReceived 11 January 2002; published 20 June 2002 We compute the entanglement cost of several families of bipartite mixed states, including arbitrary mixtures of two Bell states. This is achieved by developing a technique that allows us to ascertain the additivity of the entanglement of formation for any state supported on specific subspaces. As a side result, the proof of the irreversibility in asymptotic local manipulations of entanglement is extended to two-qubit systems. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.027901
DOI:
10.1103/PhysRevLett.89.027901
PACS:
03.65.Ud, 03.65.Ca, 03.67.Hk
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