Quantum properties and dynamics of X states

TL;DR

This paper provides a comprehensive analysis of the quantum properties and dynamics of X states, a broad class of two-qubit states, including entanglement, discord, and their transformations.

Contribution

It offers a detailed account of quantum properties of X states and characterizes their structure-preserving transformations in continuous and discrete processes.

Findings

Characterization of entanglement and discord in X states

Analysis of structure-preserving transformations

Insights into quantum dynamics of X states

Abstract

X states are a broad class of two-qubit density matrices that generalize many states of interest in the literature. In this work, we give a comprehensive account of various quantum properties of these states, such as entanglement, negativity, quantum discord and other related quantities. Moreover, we discuss the transformations that preserve their structure both in terms of continuous time evolution and discrete quantum processes.