3 ms·

So this is all about sending data more securely: Imagine a spy trying to intercept the quantum message. They'd have to measure the quantum state to read it, but

So this is all about sending data more securely: Imagine a spy trying to intercept the quantum message. They'd have to measure the quantum state to read it, but measuring it automatically changes it! The intended receiver would immediately know someone tampered with the message. But it's all just at light speed. The only breakthru is we can do it on existing fiber lines even with tons of other traffic on the lines.

Terr_ 2y ago
> But it's all just at light speed. To put a finer point on it: Any information flow is hard-limited to the speed of our best regular communication. (E.g. Light traveling slower-than-in-vaccuum through thin glass tubes, zig-zag bouncing inside and also following the cable's meandering path over the Earth's surface.)