# Super quantum discord for general two qubit X states

## TL;DR

This paper derives exact solutions for super quantum discord in general two-qubit X states, revealing how it can vary under phase damping channels, thus advancing understanding of quantum correlations.

## Contribution

It provides the first exact solutions of super quantum discord for general two-qubit X states in a unified framework.

## Key findings

- Super quantum discord can increase or decrease under phase damping.
- Exact solutions are expressed in terms of a single-variable function.
- Solutions cover nontrivial regions of a seven-dimensional manifold.

## Abstract

The exact solutions of the super quantum discord are derived for general two qubit X states in terms of a one-variable function. Several exact solutions of the super quantum discord are given for the general X-state over nontrivial regions of a seven dimensional manifold. It is shown that the super quantum discord of the X state may increase or decreases under the phase damping channel.