Mechanism of entanglement preservation

Details Mechanism of entanglement preservation Mechanism of entanglement preservation

2009-10-29

arxiv.org/abs/0910.5622v2

Phys. Rev. A 81, 052330 (2010)

Physics

Quantum Physics

6 pages, 6 figures. To appear in Phys. Rev. A

Scientific paper

We study the entanglement preservation of two qubits locally interacting with their reservoirs. We show that the existence of a bound state of the qubit and its reservoir and the non-Markovian effect are two essential ingredients and their interplay plays a crucial role in preserving the entanglement in the steady state. When the non-Markovian effect is neglected, the entanglement sudden death (ESD) is reproduced. On the other hand, when the non-Markovian is significantly strong but the bound state is absent, the phenomenon of the ESD and its revival is recovered. Our formulation presents a unified picture about the entanglement preservation and provides a clear clue on how to preserve the entanglement in quantum information processing.

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