Separability of Mixed States: Necessary and Sufficient Conditions

Details Separability of Mixed States: Necessary and Sufficient Conditions Separability of Mixed States: Necessary and Sufficient Conditions

1996-05-28

arxiv.org/abs/quant-ph/9605038v2

Physics

Quantum Physics

Revtex, 13 pages, replaced with minor typos corrected and some examples added

Scientific paper

10.1016/S0375-9601(96)00706-2

We provide necessary and sufficient conditions for separability of mixed states. As a result we obtain a simple criterion of separability for $2\times2$ and $2\times3$ systems. Here, the positivity of the partial transposition of a state is necessary and sufficient for its separability. However, it is not the case in general. Some examples of mixtures which demonstrate the utility of the criterion are considered.

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