Pairwise Quantum Correlations for Superpositions of Dicke States
Zhengjun Xi, Heng-Na Xiong, Yongming Li, and Xiaoguang Wang
TL;DR
This paper investigates quantum correlations in two-qubit states derived from Dicke states and their superpositions, providing a compact expression for quantum discord and comparing it with entanglement measures.
Contribution
It introduces a compact expression for quantum discord in two-qubit X states from Dicke states and analyzes their quantum correlations.
Findings
Quantum discord expressions for Dicke state-derived two-qubit states.
Comparison between quantum discord and entanglement of formation.
Insights into quantum correlations in superpositions of Dicke states.
Abstract
Pairwise correlation is really an important property for multi-qubit states. For the two-qubit X states extracted from Dicke states and their superposition states, we obtain a compact expression of the quantum discord by numerical check. We then apply the expression to discuss the quantum correlation of the reduced two-qubit states of Dicke states and their superpositions, and the results are compared with those obtained by entanglement of formation, which is a quantum entanglement measure.
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