Constraints on the uncertainties of entangled symmetric qubits

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We derive necessary and sufficient inseparability conditions imposed on the variance matrix of symmetric qubits. These constraints are identified by examining a structural parallelism between continuous variable states and two qubit states. Pairwise entangled symmetric multiqubit states are shown here to obey these constraints. We also bring out an elegant local invariant structure exhibited by our constraints.
5 pages, REVTEX, Improved presentation; Theorem on neccessary and sufficient condition included; To appear in Phys. Lett. A

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Quantum Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/127509

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/quant-ph/0601035
 http://arxiv.org/abs/quant-ph/0601035
 Phys. Lett. A 364, 203 (2007)
 doi:10.1016/j.physleta.2006.11.073

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