Quantum Discord of Certain Two-Qubit States
Quantum discord is an effective measure of quantum correlation introduced by Olliver and Zurek. We evaluate analytically the quantum discord for a large family of non-X-states. Exact solutions of the quantum discord are obtained for four parametric spaces of non-X-states. Dynamic behavior of the quantum discord is also explored under the action of the Kraus operator.
KeywordsQuantum discord Quantum correlations Bipartite quantum states Optimization on manifolds
The corresponding author gratefully acknowledges the partial support of NSFC grants 11426116, 11501251 and 11871325 during this work. The third author is supported by NSFC grant 11531004 and Simons Foundation grant 523868.