Mechanism of entanglement preservation
Abstract
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.
Keywords
Cite
@article{arxiv.0910.5622,
title = {Mechanism of entanglement preservation},
author = {Qing-Jun Tong and Jun-Hong An and Hong-Gang Luo and C. H. Oh},
journal= {arXiv preprint arXiv:0910.5622},
year = {2015}
}
Comments
6 pages, 6 figures. To appear in Phys. Rev. A