| dc.contributor.author |
Bylicka, Bogna |
| dc.contributor.author |
Chruściński, Dariusz |
| dc.date.accessioned |
2012-11-30T08:46:17Z |
| dc.date.available |
2012-11-30T08:46:17Z |
| dc.date.issued |
2010-04-03 |
| dc.identifier.citation |
Phys. Rev. A 81, 062102 (2010) |
| dc.identifier.uri |
http://repozytorium.umk.pl/handle/item/181 |
| dc.description.abstract |
Bipartite states with vanishing quantum discord are necessarily separable and hence positive partial transpose (PPT). We show that 2 x N states satisfy additional property: the positivity of their partial transposition is recognized with respect to the canonical factorization of the original density operator. We call such states SPPT (for strong PPT). Therefore, we provide a natural witness for a quantum discord: if a 2 x N state is not SPPT it must contain nonclassical correlations measured by quantum discord. It is an analog of the celebrated Peres-Horodecki criterion: if a state is not PPT it must be entangled. |
| dc.language.iso |
eng |
| dc.relation.uri |
http://arxiv.org/abs/1004.0434 |
| dc.rights |
info:eu-repo/semantics/openAccess |
| dc.subject |
Quantum Physics |
| dc.title |
Witnessing quantum discord in 2 x N systems |
| dc.type |
info:eu-repo/semantics/article |
