Subhash Kak, Yuhua Chen, Pramode Verma
This paper reports a variant of the three-stage quantum cryptography protocol which can be used in low intensity laser output regimes. The variant, which tracks the intensity of the laser beam at the various stages, makes the task of the eavesdropper harder than the standard K06 protocol. The constraints on the iAQC protocol are much lesser than those on BB84 and just like the K06 protocol it can not only be used for key distribution but also for direct bitwise encryption of data. The iAQC protocol is an improvement on the K06 protocol in that it makes the task of the eavesdropper harder. It can also be used to transmit polarization states that carry additional information if the transmission states are polarization angles.
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http://arxiv.org/abs/1206.6778
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