Ultra-bright entangled-photon pair generation from an AlGaAs-on-insulator microring resonator [article]

Trevor J. Steiner, Joshua E. Castro, Lin Chang, Quynh Dang, Weiqiang Xie, Justin Norman, John E. Bowers, Galan Moody
2020 arXiv   pre-print
Entangled-photon pairs are an essential resource for quantum information technologies. Chip-scale sources of entangled pairs have been integrated with various photonic platforms, including silicon, nitrides, indium phosphide, and lithium niobate, but each has fundamental limitations that restrict the photon-pair brightness and quality, including weak optical nonlinearity or high waveguide loss. Here, we demonstrate a novel, ultra-low-loss AlGaAs-on-insulator platform capable of generating
more » ... nergy entangled photons in a Q >1 million microring resonator with nearly 1,000-fold improvement in brightness compared to existing sources. The waveguide-integrated source exhibits an internal generation rate greater than 20× 10^9 pairs sec^-1 mW^-2, emits near 1550 nm, produces heralded single photons with >99% purity, and violates Bell's inequality by more than 40 standard deviations with visibility >97%. Combined with the high optical nonlinearity and optical gain of AlGaAs for active component integration, these are all essential features for a scalable quantum photonic platform.
arXiv:2009.13462v1 fatcat:pj7j64xkb5ekdfg3jidvrxfuni