Ultraprecise phase manipulation in integrated photonic quantum circuits with generalized directional couplers

We present an innovative approach for ultra-precise phase manipulation in integrated photonic quantum circuits. To this end, we employ generalized directional couplers that utilize a detuning of the propagation constant in optical waveguides by the overlap of adjacent waveguide modes. We demonstrate our findings in experiments with classical as well as quantum light. (C) 2014 AIP Publishing LLC.