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South Africa and China establish record-breaking 12,900 km ultra-secure quantum satellite link.
(www.eurekalert.org)
this post was submitted on 20 Mar 2025
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This is not a "quantum entangled data link", it is a regular radio data link secured using quantum computing to generate encryption keys.
But why
Because you can use one time pad encryption which is theoretically unbreakable. Intercepting the photons used to generate these keys would instantly alter their state thus making them unusable.
oh right one time pad.
It really does feel like you could do this in a better way, though.
I've read some weird paper about such an analog channel, where something quantum on both sides was used to create another analog signal used kinda as an encryption key. Stumbled upon it trying to understand some things about optics long ago.