Purified discord and multipartite entanglement

Brown, Eric G., Webster, Eric J., Martin-Martinez, Eduardo and Kempf, Achim (2013) Purified discord and multipartite entanglement. Annals of Physics, 337 153-162. doi:10.1016/j.aop.2013.06.015

Author Brown, Eric G.
Webster, Eric J.
Martin-Martinez, Eduardo
Kempf, Achim
Title Purified discord and multipartite entanglement
Journal name Annals of Physics   Check publisher's open access policy
ISSN 0003-4916
Publication date 2013-10
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.aop.2013.06.015
Open Access Status
Volume 337
Start page 153
End page 162
Total pages 10
Place of publication Maryland Heights, MO, United States
Publisher Academic Press
Collection year 2014
Language eng
Formatted abstract
We study bipartite quantum discord as a manifestation of a multipartite entanglement structure in the tripartite purified system. In particular, we find that bipartite quantum discord requires the presence of both bipartite and tripartite entanglement in the purification. This allows one to understand the asymmetry of quantum discord, D(A,B)≠D(B,A) in terms of entanglement monogamy. As instructive special cases, we study discord for qubits and Gaussian states in detail. As a result of this we shed new light on a counterintuitive property of Gaussian states: the presence of classical correlations necessarily requires the presence of quantum correlations. Finally, our results also shed new light on a protocol for remote activation of entanglement by a third party.
Keyword Quantum discord
Multipartite entanglement
Remote quantum resource activation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 3 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 3 times in Scopus Article | Citations
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