Curator's Take
This breakthrough demonstrates that quantum key distribution (QKD) has reached a critical threshold for real-world deployment, with device-independent protocols now operating successfully across distances that span entire metropolitan areas. The 100-kilometer range represents a significant leap forward because it proves quantum-secured communications can work at citywide scales without relying on trusted hardware components, addressing one of the key vulnerabilities that previously limited QKD's practical adoption. This milestone brings us considerably closer to quantum-secured internet infrastructure that could protect critical communications networks from both current cyber threats and future quantum computer attacks. The achievement signals that quantum cryptography is transitioning from laboratory curiosity to viable technology for securing tomorrow's digital communications.
— Mark Eatherly
Summary
Device-independent quantum-encrypted keys distributed over 100 km The post Quantum-secure Internet expands to citywide scale appeared first on Physics World .