Two measurement settings can suffice to verify multipartite entanglement

Details Two measurement settings can suffice to verify multipartite entanglement Two measurement settings can suffice to verify multipartite entanglement

2004-09-20

arxiv.org/abs/quant-ph/0409132v1

AIP Conf. Proc. 734, 234 (2004)

Physics

Quantum Physics

4 pages including a figure, LaTeX; to appear in the conference proceedings of QCMC04

Scientific paper

10.1063/1.1834423

We present entanglement witnesses for detecting genuine multi-qubit entanglement. Our constructions are robust against noise and require only two local measurement settings, independent of the number of qubits. Thus they allow to verify entanglement of many qubits in experiments while requiring only a small effort. In contrast, usual methods need an effort which increases exponentially with the number of qubits. The witnesses detect states close to GHZ states and cluster states.

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