Mixed State Entanglement Measures for Intermediate Separability

Details Mixed State Entanglement Measures for Intermediate Separability Mixed State Entanglement Measures for Intermediate Separability

2009-11-22

arxiv.org/abs/0911.4245v2

Int. J. Quant. Info. 8 (2010) 677

Physics

Quantum Physics

5 pages 2 figures

Scientific paper

10.1142/S0219749910006526

To determine whether a given multipartite quantum state is separable with respect to some partition we construct a family of entanglement measures R_m. This is done utilizing generalized concurrences as building blocks which are defined by flipping of M constituents and indicate states that are separable with regard to bipartitions when vanishing. Further, we provide an analytically computable lower bound for R_m via a simple ordering relation of the convex roof extension. Using the derived lower bound, we illustrate the effect of the isotropic noise on a family of four-qubit mixed states for each intermediate separability.

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