We evaluate analytically the quantum discord for a large family of multiqubit states. It is interesting to note that three-qubits and five-qubits same, as two-qubits six-qubits. discover this states can be concluded into three categories. The level surfaces in categories shown through images. Furthermore, we investigated dynamic behavior under decoherence. For odd partite systems, prove frozen ...

Any two-qubit state can be represented, geometrically, as an ellipsoid with a certain size and center located within the Bloch sphere of one of the qubits. Points of this ellipsoid represent the postmeasurement states when the other qubit is measured. Based on the most demolition concept in the definition of quantum discord, we study the amount of demolition when the two post-measurement states...

The squashed entanglement quantifies the amount of entanglement in a bipartite quantum state, and it satisfies all of the axioms desired for an entanglement measure. The quantum discord is a measure of quantum correlations that are different from those due to entanglement. What these two measures have in common is that they are both based upon the conditional quantum mutual information. In [Ber...