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International Journal of Theoretical Physics

Quantum Entanglement and Quantum Discord of a Two-Qubit System in a Dissipative Cavity

H. Aiobi, S. Salimi, A. S. Khorashad

Published Sep 2, 2015• 8 citations
Publisher
DOI
10.1007/s10773-015-2788-7

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The quantum dynamics of two entangled two-level atoms initially in extended Werner-like (EWL) states is studied. Each of the two atoms is located within an isolated and dissipative cavity. If the interaction time of atoms and cavities is not very long, the amount of quantum discord and entanglement between two atoms decreases as the system evolves. The sudden death of quantum discord and entanglement of two atoms occurs within a short interaction time. However, after a long interaction time, quantum discord and entanglement of two atoms could be partially preserved due to the long-lived nature of quantum discord and entanglement. Surprisingly, we find the amount of long-lived quantum discord could be smaller than that of long-lived entanglement. Thus, entanglement may be more robust than quantum discord against decoherence.