Taming multiparticle entanglement

Details Taming multiparticle entanglement Taming multiparticle entanglement

2010-10-28

arxiv.org/abs/1010.6049v2

Phys. Rev. Lett. 106, 190502 (2011)

Physics

Quantum Physics

4 pages + appendix, 2 figures, published version; see http://www.mathworks.com/matlabcentral/fileexchange/30968 for associated

Scientific paper

10.1103/PhysRevLett.106.190502

We present an approach to characterize genuine multiparticle entanglement using appropriate approximations in the space of quantum states. This leads to a criterion for entanglement which can easily be calculated using semidefinite programming and improves all existing approaches significantly. Experimentally, it can also be evaluated when only some observables are measured. Furthermore, it results in a computable entanglement monotone for genuine multiparticle entanglement. Based on this, we develop an analytical approach for the entanglement detection in cluster states, leading to an exponential improvement compared with existing schemes.

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