Multi photon quantum information science and technology in integrated optics Photons are an attractive option for testing fundamental quantum physics and developing new quantum enhanced technology including highly advanced computers and simulators as well as precision sensing beyond shot noise. Traditionally bulk optical components have been bolted onto optical benches to realize metre scale quantum circuits. However this approach is ultimately proving unwieldy for increasing the complexity and for scaling up to practical quantum technologies based on photons. The work presented here demonstrates a series of quantum photonic devices based on waveguide circuits embedded in miniature monolithic chips. This represents a paradigm shift in the underlying architecture of quantum optics and provides key building blocks for all optical and hybrid quantum technologies.