You're absolutely correct, but the irony is that the whole point of quantum encryption is to eliminate certain classes of hardware vulnerability. You could ski

You're absolutely correct, but the irony is that the whole point of quantum encryption is to eliminate certain classes of hardware vulnerability. You could skip the whole quantum thing and send a conventionally generated key over a dedicated line (regular fiber or even copper), and you'd be no more vulnerable except to hardware attacks (cable splicing or other eavesdropping tricks).