Ciro Santilli $$ Sponsor Ciro $$ 中国独裁统治 China Dictatorship 新疆改造中心、六四事件、法轮功、郝海东、709大抓捕、2015巴拿马文件 邓家贵、低端人口、西藏骚乱
You can't get more direct than this in terms of proving that photons exist!
The particular case of the double-slit experiment will be discussed at: single particle double slit experiment.
Video 7. How to use an SiPM - Experiment Video by SensLTech (2018) Source.
Video 8. Single-photon detectors - Krister Shalm by Institute for Quantum Computing (2013) Source.