ar X iv : q ua nt - p h / 02 09 04 5 v 1 5 S ep 2 00 2 Lewenstein - Sanpera Decomposition for 2 ⊗ 2 Systems
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چکیده
As it is well known, every bipartite 2⊗2 density matrix can be obtained from Bell decompos-able states via local quantum operations and classical communications (LQCC). Using this fact, the Lewenstein-Sanpera decomposition of an arbitrary bipartite 2 ⊗ 2 density matrix has been obtained through LQCC action upon Lewenstein-Sanpera decomposition of Bell decomposable states of 2 ⊗ 2 quantum systems, where the product states introduced by Wootters in [W. K. 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.
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تاریخ انتشار 2008