Hi

Just a follow up: Interestingly, a network protected by simple quantum encryption[1] has been broken, as one can read at nature news[2].
Nevertheless, it is clear to the authors:
Shapiro and Wong agree. And they add that a quantum cryptographic network can be simply tweaked to beat their attack. By making the key out of a lot of photons instead of just a few, the sender and receiver could ensure that the eavesdropper never got enough of the key to use it. Still, they say, the work shows that secrets — even quantum ones — are never entirely safe.
Important for some of us: commercial systems, like the one by idQuantique[3] are not vulnerable to this attack.


Cheers

[1] http://arxiv.org/abs/quant-ph/0702202
[2] http://www.nature.com/news/2007/0704...070423-10.html
[3] http://idquantique.com/