Hans-A. Bachor received his degrees in physics from the Universität Hannover, Germany. Since 1981 he bas worked and taught at the Australian National University, Canberra, Australia where he is now Professor and Director of the Australian Centre of Excellence in Quantum-Atom Optics. The focus of his work are experiments with nonclassical light. Timothy C. Ralph graduated from Macquarie University, Australia and received his PhD from the Australian National University. He is presently Associate Professor at the University of Queensland, Brisbane, Australia. He is also scientific manager for the Queensland node of the Australian Centre of Excellence for Quantum Computer Technology. The focus of his work is quantum information in optics.