Phys.org May 11, 2021
A team of researchers in the US (University of Maryland, University of Illinois) demonstrated a tunable source of indistinguishable photon pairs using dual-pump spontaneous four-wave mixing in a topological system comprising a two-dimensional array of resonators. They exploited the linear dispersion of the topological edge states to tune the spectral bandwidth (by about 3.5×), and thereby, tuned quantum interference between generated photons by tuning the two pump frequencies. They demonstrated energy−time entanglement and, using numerical simulations, confirmed the topological robustness of the source. Their results could lead to tunable, frequency-multiplexed quantum light sources for photonic quantum technologies…read more. TECHNICAL ARTICLE
Schematic of the experimental setup. Credit: Nature Photonics (2021)Â