Entanglement Detection in Optical Lattices of Bosonic Atoms with Collective Measurements

Abstract

The minimum requirements for entanglement detection are discussed for a spin chain in which the spins cannot be individually accessed. The methods presented detect entangled states close to a cluster state and a many-body singlet state, and seem to be viable for experimental realization in optical lattices of two-state bosonic atoms. The entanglement criteria are based on entanglement witnesses and on the uncertainty of collective observables.

arXiv comment5 pages, revtex4, no figures; changes before publication

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