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The influence of Unruh effect on the quantum and classical correlation of aquantum entangled state is investigated, when one or two of the observers areaccelerated. It is found that the quantum and classical correlation wouldapproach to a finite value with the increase of the acceleration when only oneobserver is accelerated, but they would decrease to zero quickly when twoobservers are accelerated. The latter result implies that the gravitationalfield would break the correlation obviously when the acceleration is caused bythe gravitational field. Thus, when the two observers stay in the gravitationalfield, the quantum or classical correlation would not easy to be preserved fora long time.

Change of quantum correlation for two simultaneously accelerated observers