ESQUEMAS DE MODULAÇÃO PARA DISTRIBUIÇÃO QUÂNTICA DE CHAVES COM CODIFICAÇÃO DE FREQÜÊNCIA / MODULATION SCHEMES FOR FREQUENCY CODED QUANTUM KEY DISTRIBUTION

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

Quantum cryptography has been proposed as a solution to the cryptographic key distribution problem with absolute security guaranteed by the principles of quantum mechanics. Through this scheme it is possible to find out whether a spy tried to eavesdrop on the transmission, which was impossible to discover using classical transmission techniques. In this work a brief review of quantum cryptography theory, transmission techniques and technological problems involved were performed. It was analyzed in detail the transmission technique employing frequency coding, and a comparison was made between the different modulation schemes and the BB84 and B92 protocols. It was demonstrated that the two existing modulation formats (AM-AM and PM-PM) are in fact equivalent and a new format (AM-PM) was proposed, the only one able to accommodate classical BB84. Classical measurements were performed on the AM-AM and AMPM formats.

ASSUNTO(S)

distribuicao quantica de chaves quantum communications teoria de informacao quantica qkd quantum key distribution qkd criptografia quantica quantum cryptography quantum information theory comunicacao quantica

ACESSO AO ARTIGO

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