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Mechanism of entanglement preservation

Authors
  • Tong, Qing-Jun
  • An, Jun-Hong
  • Luo, Hong-Gang
  • Oh, C. H.
Type
Published Article
Publication Date
May 24, 2010
Submission Date
Oct 29, 2009
Identifiers
DOI: 10.1103/PhysRevA.81.052330
Source
arXiv
License
Yellow
External links

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.

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