What would a quantum internet look like?

The answer

A quantum internet would use quantum entanglement and quantum key distribution (QKD) to create communication channels that are theoretically unhackable. Any attempt to intercept a quantum signal physically disturbs it, instantly alerting both parties to the eavesdropping. China launched the world's first quantum communication satellite (Micius) in 2016 and has built a 2,000-km quantum key distribution network between Beijing and Shanghai. Challenges remain in extending range (quantum signals degrade over distance), developing quantum repeaters, and scaling the technology from point-to-point links to a true network.