Quantum discord of Bell cat-states under amplitude damping

Abstract

The evolution of pairwise quantum correlations of Bell cat-states under amplitude damping is examined using the concept of quantum discord which goes beyond entanglement. A closed expression of the quantum discord is explicitly derived. We used of the Koashi-Winter relation. A relation which facilitates the optimization process of the conditional entropy. We also discuss the temporal evolution of bipartite quantum correlations under a dephasing channel and compare the behaviors of quantum discord and entanglement whose properties are characterized through the concurrence.

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• Quantum discord in photon added Glauber coherent states of $\mathrm{GHZ}$-type
• Unified scheme for correlations using linear relative entropy