A question about quantum cryptography .
Alright, this is for the QM nerds here.
I don't really know anything about QM but I was watching a conference that Alain Aspect gave the other night and he was saying that quantum cryptography was fundamentally inviolable. As he said "God himself could not intercept a QM cryptographed message" since that if a spy would of intercept the entangled message, this would instantly collapse the wave function thus rendering the information unusable for the both the spy and the real receiver.
The problem I have with this is that I don't see why quantum cryptography would be all that full proof.
If I understood correctly you need 2 channels to send this kind of message. A "quantum" channel, where you send indecipherable entangled photons, and a classic channel where you send a "key" that will allow you to decipher the correlations between the entangled photons.
Let's say that A wants to send a message to B. What would not allow a spy X to hijack both channels thus receiving the EPR photons and the classic key ?
I dunno if my question is clear lol... tell me if it's not.
And please, don't go all Dirac on my ass, I don't know anything about the mathematics behind it : Me = |not that dumb, not that smart>
Si Dieu existe, c'est Son problème !
If God exists, it's His problem !--Graffiti on the walls of the Sorbonne (France), May 1968