Two Body X States Of Quantum Discord

Quantum information is a subject of the information processing tasks whichcould be accomplished using quantum system. It includes quantum computing,quantum communication, entanglement, quantum cryptography, quantum cor-relation and so on. Entanglement is the center issue in quantum information.Quantum discord provides a measure for quantifying quantum correlations be-yond entanglement and is very hard to compute even for two-qubit states becauseof the minimization over all possible measurements. Recently, there are some re-sults for some special states in two-qubit system. Here the quantum discord fora class of two-qubit states are investigated.