Our goal is to integrated nonlinear PDC sources with passive routing elements (e.g. 3 dB couplers, beam splitter, space switch and polarization beam splitter) and actively controllable electro-optic components (e.g. phase-modulators or polarization convertor) on a common substrate to realize application specific integrated quantum circuits.
Although we are aware that the capability to fabricate such complex quantum circuits still requires substantial future research work, first steps towards this direction are currently already under progress. One example of a sample recently developed is shown in Fig.