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The minimum requirements for entanglement detection are discussed for a spinchain in which the spins cannot be individually accessed. The methods presenteddetect entangled states close to a cluster state and a many-body singlet state,and seem to be viable for experimental realization in optical lattices oftwo-state bosonic atoms. The entanglement criteria are based on entanglementwitnesses and on the uncertainty of collective observables.Comment: 5 pages, revtex4, no figures; changes before publicatio

Entanglement detection in optical lattices of bosonic atoms with collective measurements