Optimal entanglement witnesses based on local orthogonal observables

Details Optimal entanglement witnesses based on local orthogonal observables Optimal entanglement witnesses based on local orthogonal observables

2007-05-13

arxiv.org/abs/0705.1832v3

Phys. Rev. A 76, 012334 (2007)

Physics

Quantum Physics

6 pages, 1 figure; minor changes, references added

Scientific paper

10.1103/PhysRevA.76.012334

We show that the entanglement witnesses based on local orthogonal observables which are introduced in [S. Yu and N.-L. Liu, Phys. Rev. Lett. 95, 150504 (2005)] and [O. G\"uhne, M. Mechler, G. T\'oth and P. Adam, Phys. Rev. A 74, 010301 (2006)] in linear and nonlinear forms can be optimized, respectively. As applications, we calculate the optimal nonlinear witnesses of pure bipartite states and show a lower bound on the I-concurrence of bipartite higher dimensional systems with our method.

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