Itano, W. M.Kielpinski, D.Meyer, V.Rowe, M. A.Sackett, C. A.2004-12-142004-12-1420012001http://hdl.handle.net/2003/1868010.17877/DE290R-12617enThe American Physical SocietyPhysical Review Letters530Experimental Demonstration of Entanglement-Enhanced Rotation Angle Estimation Using Trapped Ions10.1103/PhysRevLett.86.5870article (journal)