Dynamics of quantum discord in the purification process

TL;DR

This paper studies how quantum discord evolves during the purification process, showing it can increase along with mutual information and classical correlation, and provides an analytic expression for certain higher-dimensional states.

Contribution

It demonstrates that quantum discord can be increased through purification and derives an analytic formula for a class of higher-dimensional states with additive quantum discord.

Findings

Quantum discord increases after purification of Werner states.

Quantum mutual information and classical correlation also increase during purification.

Provides an analytic expression for higher-dimensional states with additive quantum discord.

Abstract

We investigate the dynamics of quantum discord during the purification process. In the case of Werner states, it is shown that quantum discord is increased after a round of purification protocol. Furthermore, quantum mutual information and classical correlation is also increased during this process.Wealso give an analytic expression for a class of higher dimensional states which have additive quantum discord.