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We study the peculiar dynamics of two qubits quantum discord with a suddenchange in behavior. It is widely agreed in the literature nowadays thatenvironment induce sudden change behavior of quantum discord. We explore thesudden change phenomenon under the action of local-independent environments,considering the discord of two-qubit which is obtained by means of the weakmeasurements on one of the two-qubit. It is shown that the sudden changephenomenon does not appear under weak measurements. We find that the quantumdiscord with weak measurements decays in a monotonic fashion, and show thatquantum discord might exhibit a sudden change only for the strong (projective)measurement. We believe that environment is not the main role of the suddenchange, but the quantum correlation itself is.

Effects of weak measurements on sudden change of quantum discord