Speaking to people in the know a little while ago, the main barrier to scaling up quantum computation by interconnecting separate devices was that you couldn't

Speaking to people in the know a little while ago, the main barrier to scaling up quantum computation by interconnecting separate devices was that you couldn't run a quantum network at a high enough bandwidth to be useful. You just couldn't generate coupled states fast enough. Assuming I've not entirely butchered the interpretation, does this help with that? It sounds to me like the transmission is at a useful frequency, but that says nothing about the bandwidth you can practically achieve.