USTC 100km Quantum Internet: Memory-Memory Entanglement and the Repeater Breakthrough

Scaling the Quantum Stack

Researchers at the University of Science and Technology of China (USTC) have demonstrated a 100-km device-independent quantum key distribution (DI-QKD) milestone...

The Quantum Repeater Architecture

Scaling quantum communication over long distances requires overcoming the 'no-cloning' theorem. USTC achieved this using a quantum repeater that establishes memory-memory entanglement. * Coherence Time: The team managed to maintain qubit states across long-lived memories for long enough to perform entanglement swapping. * DI-QKD Protocol: Unlike traditional QKD, the device-independent protocol provides security even if the hardware itself is not fully trusted.

Why It Matters

This proof-of-concept is the blueprint for a scalable, city-to-city quantum internet that is theoretically immune to traditional interception methods.