Multipartite reduction criteria for separability

Details Multipartite reduction criteria for separability Multipartite reduction criteria for separability

2005-04-20

arxiv.org/abs/quant-ph/0504154v2

Physics

Quantum Physics

6 pages, 1 figure, RevTeX

Scientific paper

10.1103/PhysRevA.72.022311

The reduction criterion is a well known necessary condition for separable states, and states violating this condition are entangled and also 1-distillable. In this paper we introduce a new set of necessary conditions for separability of multipartite states, obtained from a set of positive but not completely positive maps. These conditions can be thought of as generalisations of the reduction criterion to multipartite systems. We use tripartite Werner states as an example to investigate the entanglement detecting powers of some of these new conditions, and we also look at what these conditions mean in terms of distillation. Finally, we show that these maps can be used to give a partial solution to the subsystem problem, as described in Ref. [14].

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