[1] Tommaso Calarco is at the Institute for Quantum Information Processing,Andreas Wallraff is at the Department of Physics
[2] University of Ulm,undefined
[3] D-89069 Ulm,undefined
[4] Germany,undefined
[5] Philippe Grangier is at the Institut d'Optique,undefined
[6] Campus Polytechnique,undefined
[7] RD128,undefined
[8] F-91127 Palaiseau,undefined
[9] France,undefined
[10] ETH Zurich,undefined
[11] CH-8093 Zurich,undefined
[12] Switzerland,undefined
[13] Peter Zoller is at the Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences,undefined
[14] A-6020 Innsbruck,undefined
[15] Austria.,undefined