Beyond pure state entanglement for atomic ensembles

 Title Beyond pure state entanglement for atomic ensembles Publication Type Journal Article Year of Publication 2012 Authors Stasińska, J, Paganelli, S, Sanpera, A Journal New Journal of Physics Volume 14 Issue 3 Pagination 033034 ISSN 1367-2630 Abstract We analyze multipartite entanglement between atomic ensembles within quantum matter–light interfaces. In our proposal, a polarized light beam crosses sequentially several polarized atomic ensembles impinging on each of them at a given angle $\alpha$ i . These angles are crucial parameters for shaping the entanglement since they are directly connected to the appropriate combinations of the collective atomic spins that are squeezed. We exploit such a scheme to go beyond the pure state paradigm proposing realistic experimental settings to address multipartite mixed state entanglement in continuous variables. URL http://stacks.iop.org/1367-2630/14/i=3/a=033034 DOI 10.1088/1367-2630/14/3/033034