Advancements in Quantum Cryptography: Entangled Photon Delivery in Space

I've had a lot of requests to cover the recent announcement that a Chinese research team has successfully delivered entangle photon pairs to locations separated 1000km. The press and speculation has been a little misleading so here's my explanation of how this works and what it means. This video is my second attempt - here' my original voiceover without graphics for those who are curious. https://www.youtube.com/watch?v=CfInxdjWRZA