They talk about the problem with it so far in the article:
"The current generation of quantum cryptography systems are point-to-point connections over a single length of fibre, So they can send secure messages from A to B but cannot route this information onwards to C, D, E or F. That’s because the act of routing a message means reading the part of it that indicates where it has to be routed. And this inevitably changes it, at least with conventional routers. This makes a quantum internet impossible with today’s technology"
So to incorporate routing, we're going to have to get a bit more clever.
Well, the way that immediately comes to mind would be to send two packets per transmission. One that is point-to-point, which contains the routing information, and one that is meant to be routed without being read, but there must be something more to it as this solution seems too simple to have not been thought of.
Well they do mention that they "solved" this problem:
"Today, Richard Hughes and pals at Los Alamos National Labs in New Mexico reveal an alternative quantum internet, which they say they’ve been running for two and half years. Their approach is to create a quantum network based around a hub and spoke-type network. All messages get routed from any point in the network to another via this central hub.
This is not the first time this kind of approach has been tried. The idea is that messages to the hub rely on the usual level of quantum security. However, once at the hub, they are converted to conventional classical bits and then reconverted into quantum bits to be sent on the second leg of their journey."
With a little more reading, it seems like the issue they face now is the reliance on a secure central hub.
"The current generation of quantum cryptography systems are point-to-point connections over a single length of fibre, So they can send secure messages from A to B but cannot route this information onwards to C, D, E or F. That’s because the act of routing a message means reading the part of it that indicates where it has to be routed. And this inevitably changes it, at least with conventional routers. This makes a quantum internet impossible with today’s technology"
So to incorporate routing, we're going to have to get a bit more clever.