Generation of photon number states on demand Brattke, S. ; Guthöhrlein, G. R. ; Keller, M. ; Lange, W. ; Varcoe, B. ; Walther, Herbert Abstract Publication: Journal of Modern Optics Pub Date: June 2003 DOI: 10.1080/09500340308234555 Bibcode: 2003JMOp...50.1103B