Lower bounds on concurrence and separability conditions

Details Lower bounds on concurrence and separability conditions Lower bounds on concurrence and separability conditions

2006-11-22

arxiv.org/abs/quant-ph/0611229v4

Phys. Rev. A 75, 052320 (2007); 77, 039903(E) (2008)

Physics

Quantum Physics

5 pages, 1 figure; minor changes, references added; final version: minor correction in proof of lemma 1, scope of theorem 2 cl

Scientific paper

10.1103/PhysRevA.75.052320

We obtain analytical lower bounds on the concurrence of bipartite quantum systems in arbitrary dimensions related to the violation of separability conditions based on local uncertainty relations and on the Bloch representation of density matrices. We also illustrate how these results complement and improve those recently derived [K. Chen, S. Albeverio, and S.-M. Fei, Phys. Rev. Lett. 95, 040504 (2005)] by considering the Peres-Horodecki and the computable cross norm or realignment criteria.

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