Vavulin, Dmitrii N.Sukhorukov, Andrey2019-11-142019-11-142469-9926http://hdl.handle.net/1885/186113We describe the generation of photon pairs entangled in optical angular momentum through spontaneous four-wave mixing in circular arrays of nonlinear waveguides. We show that the incorporation of the array twist along the waveguides can enable robust generation even in the presence of defects and inhomogeneities. We present analytical results and numerical simulations based on coupled-mode equations for the classical pump field and a discrete Schrödinger equation for the biphoton wave function.This work was supported by the Australian Research Council (ARC Discovery Projects No. DP130100135 and No. DP160100619) and the Government of Russian Federation (Grant No. 074-U01).application/pdfen-AU© 2017 American Physical Society201710.1103/PhysRevA.96.013812