  Integrated quantum photonic waveguide circuits are a promising approach to
realizing future photonic quantum technologies. Here, we present an integrated
photonic quantum technology platform utilising the silicon-on-insulator
material system, where quantum interference and the manipulation of quantum
states of light are demonstrated in components orders of magnitude smaller than
in previous implementations. Two-photon quantum interference is presented in a
multi-mode interference coupler, and manipulation of entanglement is
demonstrated in a Mach-Zehnder interferometer, opening the way to an
all-silicon photonic quantum technology platform.
