## What is/are Two Qubit X?

Two Qubit X - Herein, considering two-qubit X states, the generally form of quantum steering ellipsoid is derived.^{[1]}In this paper, the model of QEPIO is devised according to the merging optimization of basic PIO algorithm and dynamics of QE in a two-qubit XXZ Heisenberg System.

^{[2]}Analytic quantifiers of the symmetric quantum discord for two-qubit X type states and block-diagonal states and the symmetric measurement induced nonlocality for any two qubit states are established on the basis of the quantum skew information.

^{[3]}On the contrary, for the one-way quantum deficit we succeeded in getting the special two-qubit X states which seem to allow one to reach all regions of quantum correlation exploiting available quantum optical techniques.

^{[4]}The transitory and steady-state entanglement of a two-qubit XY Heisenberg magnetic spin system immersed in an external magnetic field are analyzed in terms of the entanglement measure of concurrence.

^{[5]}We explicitly calculate this bound for two quantum systems: single qubit and two-qubit X-states.

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