Sudden change of interferometric power for X shape states

TL;DR

This paper investigates how the quantum interferometric power (IP) of two-qubit X states changes suddenly under various noisy environments, revealing that IP can exhibit abrupt transitions even when quantum discord does not.

Contribution

It demonstrates the occurrence of sudden change in IP under different noise models and shows that a single quantum channel can induce this phenomenon, expanding understanding of quantum correlations.

Findings

IP exhibits sudden change under various noisy environments.

A single quantum channel can trigger sudden change of IP.

Sudden change of IP occurs under composite noises.

Abstract

Quantum interferometric power (IP) is a discordlike measure. We study the dynamics of IP for two-qubit X shape states under different noisy environments. Our study shows that IP exhibits sudden change, and one side quantum channel is enough for the occurrence of a sudden change of IP. In particular, we show that the initial state having no sudden change of quantum discord exhibits a sudden change of IP under the dynamics of amplitude noise, but the converse is not true. Besides, we also investigate the dynamics of IP under two different kinds of composite noises. Our results also confirm that sudden change of IP occurs under such composite noises.