QNu Labs demos 5.56-km free-space quantum key link
In short
QNu Labs demonstrated a 5.56-km free-space quantum key link between two locations. The reported setup sent quantum keys through open air, not fibre.
This matters because it could widen where quantum security can be used. The reporting does not say when or where the demo happened, or if it is ready for customers.
What the reporting says
QNu Labs demonstrated a 5.56-km free-space quantum security link, according to a publisher summary that said the keys were transmitted between two locations. The reported distinction is that the setup did not use optical fibre, unlike standard QKD systems. The immediate implication is a step beyond fibre-based deployment, but the reporting does not say when the demo took place, where it happened, or whether it is commercially available.
Why it matters
QNu Labs demonstrated a 5.56-km free-space quantum key distribution link between two locations, according to the publisher summary. The reported significance is that the transmission did not rely on optical fibre, which could matter for future quantum-security deployments. However, the available reporting does not state the date, location, customer use, or technical performance beyond the distance.