Symmetric excitation and de-excitation of a cavity QED system Olafur Jonasson, Vidar Gudmundsson, Andrei Manolescu, Chi-Shung Tang and Hsi-Sheng Goan Eur. Phys. J. B, 86 6 (2013) 291 Published online: 24 June 2013 DOI: 10.1140/epjb/e2013-40330-x