Nonlinear entanglement witnesses

Details Nonlinear entanglement witnesses Nonlinear entanglement witnesses

2005-12-20

arxiv.org/abs/quant-ph/0512164v3

Phys. Rev. Lett. 96, 170502 (2006)

Physics

Quantum Physics

4 pages, 1 figure, v3: small changes, final version

Scientific paper

10.1103/PhysRevLett.96.170502

Entanglement detection typically relies on linear inequalities for mean values of certain observables (entanglement witnesses), where violation indicates entanglement. We provide a general method to improve any of these inequalities for bipartite systems via nonlinear expressions. The nonlinearities are of different orders and can be directly measured in experiments, often without any extra effort.

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