Quantum discord of X-states as optimization of a one variable function
Naihuan Jing, Bing Yu · Journal of Physics A Mathematical and Theoretical · 2016
We solve the quantum discord completely as an optimization of a certain one variable function for an arbitrary two qubit X state. Exact solutions of the quantum discord are obtained for several nontrivial regions of the five parametric space for the quantum state. Exceptional solutions are determined via an iterative algorithm.