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Quantum Encryption Breakthrough: Secure Keys Transmitted Across 100km of Fiber As concerns grow that quantum computers could eventually render current encryption methods obsolete , researchers are racing to design more secure alternatives. Among the most promising is Quantum Key Distribution (QKD) , a quantum-based encryption technique in which any unauthorized interception disrupts the system and is instantly detectable. Earlier versions of QKD were limited by short transmission distances and the need for highly specialized devices . Now, a Chinese research team has taken a major step forward, successfully maintaining quantum encryption over far greater distances . Reporting in Science, the team demonstrated device-independent QKD (DI-QKD) between two single-atom nodes across 100 kilometers of optical fiber . Why Quantum Key Distribution Matters Quantum Key Distribution (QKD) offers a powerful route to secure communication , but it still relies on physical channels such as fibe...