Generation of entangled photons using an arrayed waveguide grating

Abstract

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.

High‐Dimensional Quantum Communication: Benefits, Progress, and Future Challenges

“…Furthermore, the generation and propagation of OAM states through waveguides is very demanding as well, but small steps towards the reliable on-chip transmission and source integration of such states have been proved [107,138]. As previously mentioned, frequency and path degrees of freedom are the two that can be more easily controlled and manipulated on integrated devices [139][140][141]. In the following, we are going to focus and discuss in detail two very important and impressive experiments, which use path and frequency encoded high-dimensional states respectively.…”

Design and investigation of a dual-layer grating coupler for efficient vertical fiber-chip coupling

“…9) Integrated photonic waveguides have also been proved to be potential techniques for photonic quantum information experiments, such as entangled photon sources and buffers. 10,11) Although high integration benefits from the small size, connecting PICs with single-mode fibers (SMFs) (approximate core size of 10 μm) is still a problem.…”