It is well known that entanglement of formation (EOF) and relative entropy of entanglement (REE) are exactly identical for all two-qubit pure states even though their definitions are completely different. We think this fact implies that there is a veiled connection between EOF and REE. In this context, we suggest a procedure, which enables us to compute REE from EOF without relying on the converse procedure. It is shown that the procedure yields correct REE for many symmetric mixed states such as Bell-diagonal, generalized Vedral–Plenino, and generalized Horodecki states. It also gives a correct REE for less symmetric Vedral–Plenio-type state. However, it is shown that the procedure does not provide correct REE for arbitrary mixed states.
Quantum Information Processing – Springer Journals
Published: Nov 29, 2014
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