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Abstract: We study the entanglement preservation of two qubits locally interacting withtheir reservoirs. We show that the existence of a bound state of the qubit andits reservoir and the non-Markovian effect are two essential ingredients andtheir interplay plays a crucial role in preserving the entanglement in thesteady state. When the non-Markovian effect is neglected, the entanglementsudden death ESD is reproduced. On the other hand, when the non-Markovian issignificantly strong but the bound state is absent, the phenomenon of the ESDand its revival is recovered. Our formulation presents a unified picture aboutthe entanglement preservation and provides a clear clue on how to preserve theentanglement in quantum information processing.

Author: Qing-Jun Tong, Jun-Hong An, Hong-Gang Luo, C. H. Oh


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