China Just Created World’s Largest Quantum Network | Youtube | Anton Petrov (23rd Jan 2021)
This is related to a paper published on 6th January in Nature Communications [](https://www.nature.com/articles/s41586-020-03093-8).
There was another recent piece of news posted [here](https://www.reddit.com/r/lasercom/comments/l3mujp/researchers_in_china_used_drones_to_prototype_a/) on China’s work in quantum laser communication using drones, and a huge amount of research out of China looking at Quantum Key Distribution. Undoubtedly the country will be a major player in the global lasercom and quantum crytography markets for the foreseeable future. Free Space Optics has the added advantage of having very low beam divergence angle, unlike radio communication. That means much lower size, weight and power by using a laser, and makes it that much harder for someone to intercept a signal in that part of the network. Additionally it doesn’t require bandwidth licensing and supports faster data rates, meaning it paves the way for cheaper, faster, and more secure communication.
The kind people on /r/scholar have now added it to [LibGen](http://libgen.lc/scimag/?s=10.1038/s41586-020-03093-8). Your ISP might have blocked this URL. So first, make sure you’re connected to your VPN or search ‘free web proxy’.
[ Chen, YA., Zhang, Q., Chen, TY. et al. An integrated space-to-ground quantum communication network over 4,600 kilometres. Nature 589, 214–219 (2021).](https://www.nature.com/articles/s41586-020-03093-8) [https://doi.org/10.1038/s41586-020-03093-8](https://doi.org/10.1038/s41586-020-03093-8)
^( If you are interested in laser communication and networking via Free Space Optics, you can join the community on /r/lasercom.)
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