Physics – Quantum Physics
Scientific paper
2002-08-22
Physics
Quantum Physics
16 pages, Latex
Scientific paper
We obtain Lewenstein-Sanpera decomposition of iso-concurrence decomposable states of $2\otimes 2$ quantum systems. It is shown that in these systems average concurrence of the decomposition is equal to the concurrence of the state and also it is equal to the amount of violation of positive partial transpose criterion. It is also shown that the product states introduced by Wootters in [W. K. Wootters, Phys. Rev. Lett. {\bf 80} 2245 (1998)] form the best separable approximation ensemble for these states.
Akhtarshenas Seyed Javad
Jafarizadeh Mohammad Ali
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