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Efficient distillation beyond qubits

K.G.H. Vollbrecht, M.M. Wolf

Phys. Rev. A 67, 012303 **, (2003)

DOI: 10.1103/PhysRevA.67.012303 Pfeil
*arXiv.org*: quant-ph/0208152 Pfeil

Abstract: We provide generalizations of known two-qubit entanglement distillation protocols for arbitrary Hilbert space dimensions. The protocols, which are analogues of the hashing and breeding procedures, are adapted to bipartite quantum states which are diagonal in a basis of maximally entangled states. We show that the obtained rates are optimal, and thus equal to the distillable entanglement, for a (d-1) parameter family of rank deficient states. Methods to improve the rates for other states are discussed. In particular, for isotropic states it is shown that the rate can be improved such that it approaches the relative entropy of entanglement in the limit of large dimensions.