  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.
