PEREIRA, F. R. F.; http://lattes.cnpq.br/2078694618839388; PEREIRA, Francisco Revson Fernandes.
Resumen:
In this thesis, the contributions are done in the quantum key distribution’s area. These
contributions have used the theories of Shannon-Kotelnikov mapping and continuous variables
in quantum mechanics to give synthesis to the proposed and analyzed protocol. It is
used bimodal squeezed states in addition to curves in flat torus. In our protocol, which is
adaptive in term of the channel noise level, was demonstrated that the mutual information
between Alice and Bob is greater than between Alice and Eve. Therefore, we developed a
method capable to generate and transmit a secret key even when the channel noise level
is higher than the values currently accepted, by manipulating only parameters related to
the variance of the quadrature. For higher compression values and more noisy channels,
the produced key still remain secret when Eva uses the beam-sppliting attack.