Discrimination strategies for inequivalent classes of multipartite entangled states

Details Discrimination strategies for inequivalent classes of multipartite entangled states Discrimination strategies for inequivalent classes of multipartite entangled states

2010-06-07

arxiv.org/abs/1006.1313v2

Phys. Rev. A 82, 022322 (2010)

Physics

Quantum Physics

11 pages, 3 figures; published version, minor changes

Scientific paper

10.1103/PhysRevA.82.022322

How can one discriminate different inequivalent classes of multiparticle entanglement experimentally? We present an approach for the discrimination of an experimentally prepared state from the equivalence class of another state. We consider two possible measures for the discrimination strength of an observable. The first measure is based on the difference of expectation values, the second on the relative entropy of the probability distributions of the measurement outcomes. The interpretation of these measures and their usefulness for experiments with limited resources are discussed. In the case of graph states, the stabilizer formalism is employed to compute these quantities and to find sets of observables that result in the most decisive discrimination.

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