Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 35: Quantum Information: Concepts and Methods V

Q 35.4: Talk

Wednesday, March 25, 2015, 11:45–12:00, K/HS1

Separable reduced states can imply genuine multiparticle entanglement. — •Nikolai Miklin, Tobias Moroder, and Otfried Gühne — University of Siegen, Siegen, Germany

The diversity of quantum states increases with the number of particles. However, most of the interesting examples of multiparticle entangled states are classes of pure states, while mixed states are less characterized. In the present talk, we describe a class of genuine multiparticle entangled mixed states with separable marginals, but where the entanglement could be detected by looking on correlations of these marginals only. First evidence for such states was recently reported by L. Chen et al. [Phys. Rev. A 90, 042314 (2014)], but we propose a more systematic approach of finding examples of such states using semidefinite programming. Our approach enables one to find examples of these states for more than three-qubit systems and can also be used, if not all marginals are known.