Correlation tensor criteria for genuine multiqubit entanglement

Details Correlation tensor criteria for genuine multiqubit entanglement Correlation tensor criteria for genuine multiqubit entanglement

2011-10-18

arxiv.org/abs/1110.4108v2

Phys. Rev. A 84, 062305 (2011)

Physics

Quantum Physics

8 pages, 1 figure, journal version

Scientific paper

We present a development of a geometric approach to entanglement indicators. The method is applied to detect genuine multiqubit entanglement. The criteria are given in form of non-linear conditions imposed on correlation tensors. Thus they involve directly observable quantities, and in some cases require only few specific measurements to find multiqubit entanglement. The non-linearity of each of the criteria allows detection of entanglement in wide classes of states. In contrast to entanglement witnesses, which in the space of Hermitian operators define a hyperplane, the new conditions define a geometric figure encapsulating the non-fully entangled states within it.

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