About the book
Generation and control of single photons are the basis of photon-based quantum information processing. This book will review the different mechanisms for single photon generation and various methods for controlling the propagation of single photons. Single-photon sources can be realized by fluorescence from a single quantum emitter, parametric down conversion in a nonlinear medium, four-wave mixing of light, or photon blockade using the self-Kerr nonlinearity. These methods are essentially different in mechanism and possess advantages in different performance. An ideal single-photon source should have high purity and generation efficiency, and is indistinguishable. In the second part of the book we will introduce the way to control single photons. Controlling the propagation of photons at the quantum level is very important in quantum information but extremely challenging. It includes single-photon routing and switching, single-photon transistor, and so on. In the final part, this book will provide an overview on the future of applications of single photons in quantum information.