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Letter

Nature Physics 5, 494–498 (1 July 2009) | doi:10.1038/nphys1302

Realization of collective strong coupling with ion Coulomb crystals in an optical cavity

Peter F. Herskind , Aur|[eacute]|lien Dantan , Joan P. Marler , Magnus Albert & Michael Drewsen

Cavity quantum electrodynamics (CQED) focuses on understanding the interactions between matter and the electromagnetic field in cavities at the quantum level. In the past years, CQED has attracted attention especially owing to its importance for the field of quantum information.