Quantum discord and its geometric measure with death entanglement in correlated dephasing two qubits system

摘要

The quantum correlations, including entanglement and discord with itsgeometric measure, and classical correlation are studied for a bipartitepartition of a open or closed quantum system. It is found that the purity ofthe initial state plays an important role in the dynamics of quantum andclassical correlations. In the dephasing model, the quantum correlations lossand the classical correlation gain are instantaneously happen. While, thepurity of the initial state destroys the quantum correlations which is resultedby the unitary interaction. Therefore, with the purity parameter, a particularregion in which there is no state have quantum correlations can be determined.