Dynamics of Quantum Correlation in de Sitter Spacetime

In this article, we investigate the dynamics of quantum correlation for two atoms interacting with massless scalar field in the background of de Sitter spacetime. We firstly derive the solving process of master equation that governs the system evolution with initial Werner state. Then we discuss the production, revival and decay of quantum correlation for three cases of different initial states: zero-correlation state, non zero-correlation separable state and maximally entangled state. We find that quantum correlation degrades as temperature and the two-atom distance increase. Compared with the sudden death and birth of entanglement, quantum correlation change more smoothly and thus is more robust to decoherence, which can remain stable for long time when two atoms are very close.