Local correlations of mixed two-qubit states

Details Local correlations of mixed two-qubit states Local correlations of mixed two-qubit states

2009-09-09

arxiv.org/abs/0909.1634v2

Physics Letters A, 374 (2010) 2429-2433

Physics

Quantum Physics

5p, 1f

Scientific paper

10.1016/j.physleta.2010.04.004

The quantum probability distribution arising from single-copy von Neumann measurements on an arbitrary two-qubit state is decomposed into the local and nonlocal parts, in the approach of Elitzur, Popescu and Rohrlich [A. Elitzur, S. Popescu, and D. Rohrlich, Phys. Lett. A 162, 25 (1992)]. A lower bound of the local weight is proved being connected with the concurrence of the state $p_L^{\max}= 1-\mathcal{C}(\rho)$. The local probability distributions for two families of mixed states are constructed independently, which accord with the lower bound.

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