Can you elaborate which protocols they used, at least BB84? What was the key size and how long did it ake to establish local key between satellite and ground station in Austria? Note these are not ‘quantum keys’. Data is encrypted in AES256 or alike, but the keys are generated and distributed by exchanging differently polarized photons or pairs of photons and sharing results over open channels. etc..Swiss are big in this field also, probably bigger than Chinese, you can look it up. Also, there are many QKD networks, fiber and aerial. What are the challenges in applying this tech — this is not exactly fresh new technology. Can you not write about adoption and related challenges? This sounds like panacea for key distribution but it is not that simple.