Quantum-secure Internet expands to citywide scale

Curator's Take

This breakthrough represents a crucial milestone in scaling quantum key distribution from laboratory demonstrations to practical urban infrastructure, with the 100-kilometer range covering typical metropolitan areas. Device-independent quantum encryption eliminates vulnerabilities from imperfect hardware that have plagued earlier quantum communication systems, making this approach significantly more secure against sophisticated attacks. The citywide scale demonstrates that quantum-secured networks are transitioning from proof-of-concept to deployable technology that could soon protect critical infrastructure like financial networks and government communications. This development brings us measurably closer to a quantum internet where major cities could be connected by unhackable communication channels, fundamentally reshaping cybersecurity in an era of growing digital threats.

— Mark Eatherly