Would anybody with more knowledge care to comment on this? This article leads one to believe that one can eavesdrop without being detected and with nearly 5/6ths confidence of the data on a quantum crypto communication. This is in contrast to the claim to fame of quantum crypto that the receiver will know if there is an eavesdropper. (This is what makes quantum crypto work when all public key crypto gets broken.)
Quantum crypto has "1 photon"="1 bit" with the polarization of the photon giving the 1 or 0 of the bit. It seems photon polarization state can be duplicated with nearly 5/6th confidence. From: <http://physicsweb.org/article/news/6/3/21> Near-perfect copies of single photons have been made in the lab for the first time... The Oxford team sent a photon from one such pair [of entangled photons] into an optically active crystal where it stimulated the emission of a further photon. There is an increased chance that the new photon will have the same polarization as the 'input' photon. In contrast, photons that are emitted spontaneously are equally likely to be in either polarization state. There is also an abstract at: <http://www.sciencemag.org/cgi/content/abstract/1068972v1> Experimental Quantum Cloning of Single Photons Antía Lamas-Linares, Christoph Simon, John C. Howell, Dik Bouwmeester -Michael Heyman --------------------------------------------------------------------- The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to [EMAIL PROTECTED]