Hypothetically impossible. Routing requires understanding where the packet is to go, combining it with other packets going through the "router" and then sending

Hypothetically impossible. Routing requires understanding where the packet is to go, combining it with other packets going through the "router" and then sending those along to their destination in an efficient way. To do this inspection of the packets, you have to get information from it in some way. Our understanding of quantum physics doesn't allow this, so trying to inspect the packet in any way will create a false positive that the encryption has been broken. There's no way(again, that we know of) that can tell a false positive from a real positive in this case.