Simple analysis of security of the BB84 quantum key distribution protocol

摘要

A simple proof of security of the BB84 protocol is presented in this paper. The proof is achieved in an information-theoretic way without referring to the formalism of quantum error-correction codes. Two examples are presented and discussed, showing that some previous results are special cases of the framework in this paper. It is suggested that the proof here sheds new light on security analysis of quantum key distribution, and that its technique may also improve the studies of other quantum information tasks.