Physics – Quantum Physics
Scientific paper
2010-05-27
Physics
Quantum Physics
4.2 pages, 4 figures
Scientific paper
Correlation function and mutual information are two powerful tools to characterize the correlations in a quantum state of a composite system, widely used in many-body physics and in quantum information science, respectively. We find that these two tools may give different conclusions about the order of the degrees of correlation in two specific two-qubit states. This result implies that the orderings of bipartite quantum states according to the degrees of correlation depend on which correlation measure we adopt.
Dong R. X.
Zhou Dong-Lin
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