QIQB Seminar (Dec 10,16:00-17:00) Prof. Chao-Yang Lu "Scalable photonic quantum technologies"
The main challenge for large-scale photonic quantum technology lies in the lack of a perfect single-photon sources. In this talk, I will report recent progress towards developing high-performance quantum light sources. Using parametric down-conversion, we produce two-photon source with simultaneously a collection efficiency of 97% and an indistinguishability of 96% between independent photons. Using a quantum dot-micropillar, we produced single photons with high purity (>99%), near-unity indistinguishability for >1000 photons, and high extraction efficiency—all combined in a single device compatibly and simultaneously. We developed bichromatic laser excitation [Nature Physics, 2019] and elliptical microcavites [Nature Photonics, 2019] to overcome the polarization filtering to create truly optimal single photon sources. The highest-quality single photons allowed us to perform quantum interference with sunlight with 80% raw visibility [PRL 2019]. We report boson sampling with 20 single photons injecting into 60-mode interferometer at a state space of 10^14 [arXiv.1910.09930].