Phase-controlled integrated photonic quantum circuits
Brian J. Smith, Dmytro O. Kundys, Nicholas L. Thomas-Peter, Peter G. R. Smith, Ian A. Walmsley · Optics Express · 2009
Scalable photonic quantum technologies are based on multiple nested interferometers. To realize this architecture, integrated optical structures are needed to ensure stable, controllable, and repeatable operation. Here we show a key proof-of-principle demonstration of an externallycontrolled photonic quantum circuit based upon UV-written waveguide technology. In particular, we present non-classical interference of photon pairs in a Mach-Zehnder interferometer constructed with X couplers in an integrated optical circuit with a thermo-optic phase shifter in one of the interferometer arms.