IonQ QKD Network — Europe's Largest

IonQ’s Romania QKD network—with 36 quantum-secured links spanning 1,500 kilometers—is Europe’s largest operational deployment, defending against the quantum threat now rather than later. Unlike post-quantum cryptography standards, QKD’s security is physics-based: measuring a photon’s quantum state disturbs it, making eavesdropping detectable. The network integrates with EuroQCI, targeting EU-wide quantum-secure communications, and addresses banking, government, and military use cases where sensitivity justifies the cost premium. For context, China’s 2,000-km Beijing-Shanghai line has operated since 2017; Europe is rapidly catching up.