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arXiv · 1101.3408

Geometric measure of quantum discord over two-sided projective measurements

Jianwei Xu
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Abstract

The original definition of quantum discord of bipartite states was defined over one-sided projective measurements, it describes quantum correlation more extensively than entanglement. Dakic, Vedral, and Brukner [Phys. Rev. Lett. 105 (2010) 190502] introduced a geometric measure for this quantum discord, and Luo, Fu [Phys. Rev. A 82 (2010) 034302] simplified the variation expression of it. In this paper we introduce a geometric measure for the quantum discord over two-sided projective measurements. A simplified expression and a lower bound of this geometric measure are derived and explicit expressions are obtained for some special cases.

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Jianwei Xu. 2011-01-18. Geometric measure of quantum discord over two-sided projective measurements. https://doi.org/10.1016/j.physleta.2011.10.072

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