Physics – Quantum Physics
Scientific paper
2010-05-26
International J. Quant. Inf. 8 (No. 5), 869 (2010)
Physics
Quantum Physics
12pages, no figure, will appear in IJQI
Scientific paper
So far there is no closed formula for relative entropy of entanglement of arbitrary two-qubit states. In this paper we present a method, which guarantees the derivation of the relative entropy of entanglement for most states that have $z$-directional Bloch vectors. It is shown that the closest separable states for those states also have $z$-directional Bloch vectors though there are few exceptions.
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