Close-up of the Li-Fi connection between the two QKD nodes. Credit: KeeQuant
The German consortium QuINSiDa has achieved a major step toward mobile quantum-secure communication. They demonstrated a one-of-a-kind free-space data transfer channel supporting, for the first time, LiFi and major quantum key distribution (QKD) implementations. Additionally, the system integrates key management (KMS), encryption, and monitoring, illustrating technological readiness.
This architecture enables quantum-secure key delivery without relying on fiber or radio, opening new possibilities for high-security networks where flexible infrastructure is desirable.
So far, most quantum communication systems depended on dedicated fiber networks, limiting their flexibility. QuINSiDa has now demonstrated an integrated optical-wireless quantum security stack in the laboratory, combining free-space Continuous- and Discrete-Variable QKD (CV/DV-QKD) with Li-Fi and connecting the result to key management, encryption, and monitoring.
The setup operates over a line-of-sight optical link, enabling quantum-secure key distribution for civil critical infrastructure applications, including maritime and harbor connectivity, industrial campuses, aviation, automotive environments, temporary secure networks, and fixed-to-mobile links. The design allows to conveniently deploy and monitor the system while remaining compatible with existing security workflows.
