Fibre-based QKD

Quantum key distribution using optical fiber for photon transmission, most common QKD deployment method. Fiber QKD achieves 100-500 km range depending on fiber quality and technology. QNu Labs Armos QKD demonstrates 500+ km fiber range. Advantages: existing fiber infrastructure reuse, stable environment, metropolitan/inter-city deployment. Limitations: fiber attenuation limits distance, requires fiber infrastructure.

‍

Fiber provides stable controlled environment for photon transmission enabling reliable QKD. Existing telecom fiber infrastructure enables cost-effective QKD deployment. Fiber QKD achieves highest key rates and longest terrestrial distances.

‍

QNu Labs Armos achieves 500+ km fiber QKD enabling intercity quantum security. Metropolitan QKD networks use existing fiber connecting government/financial sites. Telecom operators deploy fiber QKD as value-added security service.

‍