It is well known that many operations in quantum information processingdepend largely on a special kind of quantum correlation, that is, entanglement.However, there are also quantum tasks that display the quantum advantagewithout entanglement. Distinguishing classical and quantum correlations inquantum systems is therefore of both fundamental and practical importance. Inconsideration of the unavoidable interaction between correlated systems and theenvironment, understanding the dynamics of correlations would stimulate greatinterest. In this study, we investigate the dynamics of different kinds ofbipartite correlations in an all-optical experimental setup. The sudden changein behaviour in the decay rates of correlations and their immunity againstcertain decoherences are shown. Moreover, quantum correlation is observed to belarger than classical correlation, which disproves the early conjecture thatclassical correlation is always greater than quantum correlation. Ourobservations may be important for quantum information processing.
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