Pairwise Quantum Correlations for Superpositions of Dicke States |
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Authors: | XI Zheng-Jun XIONG Heng-Na LI Yong-Ming WANG Xiao-Guang |
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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 |
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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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Keywords: | quantum correlation quantum discord entanglement Dicke states |
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