A criterion for entanglement in two two-level systems

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We prove a necessary and sufficient condition for the occurrence of entanglement in two two-level systems, simple enough to be of experimental interest. Our results are illustrated in the context of a spin star system analyzing the exact entanglement evolution of the central couple of spins.
4 pages, Submitted to Physical Review Letters

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Quantum Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/139474

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0706.4399
 http://arxiv.org/abs/0706.4399
 J. Phys. A: Math. Theor. 40 (2007) F935-F941

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arXiv