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Tri-partite Entanglement Witnesses and Sudden Death

Authors
  • Weinstein, Yaakov S.
Type
Published Article
Publication Date
Dec 25, 2008
Submission Date
Dec 25, 2008
Identifiers
DOI: 10.1103/PhysRevA.79.012318
Source
arXiv
License
Yellow
External links

Abstract

I explore entanglement dynamics in a three qubit system comparing the ability of entanglement witnesses to detect tri-partite entanglement to the phenomenon of entanglement sudden death (ESD). Using a system subject to dephasing I invoke entanglement witnesses to detect tri-partite GHZ and W-type entanglement and compare the evolution of their detection capabilites with the evolution of the negativity, bi-partite concurrence, and tri-partite negativity. Interestingly, I find a state in which there is no concurrence or tri-partite negativity but there is entanglement. Finally, I utilize a three qubit quantum error correction (QEC) code to address how ESD affects the abilities of quantum error correction.

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