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Q: Quantenoptik und Photonik

Q 22: Poster Quanteninformation, -kommunikation und -computer

Q 22.4: Poster

Dienstag, 23. März 2004, 14:00–16:00, Schellingstr. 3

Multi-party entanglement detection in spin chains with simple measurements — •Geza Toth — Max Planck Institute for Quantum Optics,Theoretical Division,Hans-Kopfermann-Strasse 1., Garching, Germany D-85748

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