Bell State Generation and Pump Filtering Using Inhomogeneously Poled Nonlinear Waveguides

The generation of non-classical states of light is required for developing technologies such as quantum communication, quantum enhanced measurement and quantum computing. Traditionally quantum states of light are created using bulk optics, however more complex applications require the use of integrated optical systems to reduce decoherence. We propose an integrated device for producing spatially entangled two-photon states. The device can be engineered to produce any spatially entangled state, and furthermore real time re-configurability of the output quantum state can be achieved by varying a set of classical driving lasers, allowing any state in a chosen multidimensional quantum space to be switched to instantaneously.