Quantum discord protection from amplitude damping decoherence

TL;DR

This paper investigates how quantum discord is affected by amplitude damping decoherence and demonstrates a protocol using weak measurement and reversal to protect quantum discord in noisy environments.

Contribution

It introduces a protocol employing weak measurement and quantum measurement reversal to effectively preserve quantum discord under amplitude damping decoherence.

Findings

Quantum discord decreases under amplitude damping decoherence.

The proposed protocol successfully protects quantum discord.

Quantum correlation can be distributed in noisy environments using this method.

Abstract

Entanglement is known to be an essential resource for many quantum information processes. However, it is now known that some quantum features may be acheived with quantum discord, a generalized measure of quantum correlation. In this paper, we study how quantum discord, or more specifically, the measures of entropic discord and geometric discord are affected by the influence of amplitude damping decoherence. We also show that a protocol deploying weak measurement and quantum measurement reversal can effectively protect quantum discord from amplitude damping decoherence, enabling to distribute quantum correlation between two remote parties in a noisy environment.