An experimental comparison of Chen et al. and Bruβ quantum key distribution protocols

The practical implementation of quantum information technologies requires, for the most part, highly advanced and currently experimental procedures. One exception is quantum cryptography, or quantum key distribution, which has been successfully demonstrated in many laboratories and has reached an advanced level of development. The purpose of this paper is to present comparative studies regarding the percentages of quantum errors which appear when obtaining the cryptographic keys in the case of two quantum key distribution protocols: Chen et al. (four-state quantum key distribution scheme) and Bruβ (six-state quantum key distribution scheme). Were followed the variation of the percentage of errors in the case of these symmetrical protocols in two situations: the absence and the presence of cyber-attacks (Intercept-Resend attack), and, analyze the degree of security of the protocols.