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Pairwise Quantum Correlations for Superpositions of Dicke States
Authors:XI Zheng-Jun  XIONG Heng-Na  LI Yong-Ming  WANG Xiao-Guang
Institution:1. College of Computer Science, Shaanxi Normal University, Xi'an 710062, China; 2. Zhejiang Institute of Modern Physics, Department of Physics, Zhejiang University, Hangzhou 310027, China
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.
Keywords:quantum correlation  quantum discord  entanglement  Dicke states  
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