High-dimensional entangled state generation using an arrayed-waveguide grating

F. Baboux

Michael Kues, Christian Reimer, Piotr Roztocki +11 more

Nobuyuki Matsuda, Hidetaka Nishi, Péter Karkus +5 more

We propose an on-chip source of entangled photon pairs that uses an arrayed-waveguide grating (AWG) with multiple nonlinear input waveguides as correlated photon pair sources. The AWG wavelength-demultiplexes photon pairs created in input waveguides and simultaneously produces a high-dimensional entangled state encoded in the optical path. We implemented the device with a monolithic silicon–silica waveguide integration platform and demonstrated the entanglement of two dimensions in a proof-of-principle experiment.

Nobuyuki Matsuda, Hidetaka Nishi, Péter Karkus +5 more

We demonstrate the on-chip generation of path-entangled photon pairs using an arrayed-waveguide grating with nonlinear input waveguides. The scheme can be extended to the generation of high-dimensional entanglement.

F. Albarrán-Arriagada, G. Alvarado Barrios, F. A. Cárdenas-López +2 more

Alessandro Zecchetto, Arnault Raymond, Jean‐René Coudevylle +6 more

We demonstrate a nonlinear AlGaAs photonic chip generating biphotons with high-dimensional spatial correlations. Photon pairs are generated by parametric down conversion in a waveguide array and simultaneously spread through quantum walks along the various waveguides, allowing to generate various types of high-dimensional entangled states of light. We further implement the Su-Schriefer-Heeger model and demonstrate the topological protection of the SPDC process against disorder. These results highlight nonlinear waveguide arrays as a promising platform for exploring the interplay between nonlinearity, disorder and topology in quantum photonic circuits.