Geometric measure of quantum discord over two-sided projective measurements

Details Geometric measure of quantum discord over two-sided projective measurements Geometric measure of quantum discord over two-sided projective measurements

2011-01-18

arxiv.org/abs/1101.3408v3

Physics

Quantum Physics

Scientific paper

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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