@article {2145,
	title = {Entanglement and Tunable Spin-Spin Couplings between Trapped Ions Using Multiple Transverse Modes},
	journal = {Physical Review Letters},
	volume = {103},
	year = {2009},
	pages = {120502},
	author = {K. Kim and M.S. Chang and R. Islam and S. Korenblit and L.M. Duan and C. Monroe}
}
