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Lewenstein-Sanpera Decomposition for $2\otimes 2$ Systems

Lewenstein-Sanpera Decomposition for $2\otimes 2$ Systems,S. J. Akhtarshenas,M. A. Jafarizadeh

Lewenstein-Sanpera Decomposition for $2\otimes 2$ Systems  
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As it is well known, every bipartite $2\otimes 2$ density matrix can be obtained from Bell decomposable states via local quantum operations and classical communications (LQCC). Using this fact, the Lewenstein-Sanpera decomposition of an arbitrary bipartite $2\otimes 2$ density matrix has been obtained through LQCC action upon Lewenstein-Sanpera decomposition of Bell decomposable states of $2\otimes 2$ quantum systems, where the product states introduced by Wootters in [W. K. Wootters, Phys. Rev. Lett. {\bf 80} 2245 (1998)] form the best separable approximation ensemble for Bell decomposable states. It is shown that in these systems the average concurrence of the Lewenstein-Sanpera decomposition is equal to the concurrence of these states.
Published in 2002.
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