Tesis
Teletransporte quântico na presença de ruído
Fecha
2016-04-01Autor
Gomes, Raphael Fortes Infante
Institución
Resumen
The main focus of this work is to explore the feasibility of conducting the
teleportation protocol in scenarios where the presence of an external environment
reduces the purity of the input state and the transmission channel. To
investigate the behavior of these protocols under realistic conditions, we selected
the main decoherence maps reported in the literature concerning the
description of this phenomenon, including the representation of mixed states
through the Kraus operators and systems in thermal equilibrium whose Hamiltonian
is described by the Heisenberg model. In this context, we proved
that there are cases in which the in uence of external factors (such as increasing
temperature and decoherence rates) and the immersion of those qubits in
distinct environments help increasing the similarity between the properties of
the original information and the teleported state. In addition, we studied the
probabilistic teleportation protocol under the in uence of the same noise conditions
analysed for the deterministic protocol, and the results here obtained
show that the rst process can outperform the expected value of the average
delity of the teleported state.