Well, that's a viable commentary on a possible communication channel. Much more than what I was expecting. But the one thing that it does not do is store bandwidth, that's a bad title.

It does store "bandwidth" specifically of the quantum channel, and only because there is no information going through it.

Anyway, the idea of storing qbits is quite interesting, but I don't think even that would make quantum cryptography useful.

Author should comment on the difficulty of performing a bell-state measurement.