2014-09-052014-09-052011-03-04Bastos, Wellison Peixoto - Troca de Emaranhamento e Teletransporte Controlado no contexto de rotações de Faraday fotônicas - 2011 - 82 f.- Dissertação - Programa de Pós-graduação em Fisica (IF) - Universidade Federal de Goiás - Goiânia - Goiás - Brasil.http://repositorio.bc.ufg.br/tede/handle/tde/3027Taking advantage of the Faraday rotations that occur in a photonic cristal placed in an optical cavity with low quality factor, we proposed two schemes to obtain the swapping of entanglement of atomic states, useful in quantum communication and quantum computation. They employ three-level atoms in a -configuration, a linearly polarized photon source, a single detector, and a quarter wave plate. Three (four) cavities are used in the first (second) scheme. An additional scheme was also proposed to obtain controlled teleportation of superposition states, partial controlled teleportation of entangled states and controlled teleportation of entanglement. In all schemes we have included the imperfections that affect the system, such as transmission and coupling of photons in optical components, the fraction of photons with a desired polarization, the quantum efficiency of single photon detection, the effective solid angle where the photon are collected, and the rate of emitted photons by the source. Under these realistic conditions we estimate the success probability of each proccess, including the time spent for its realization.application/pdfAcesso abertorotações de Faradaycomunicação quânticafótons – TeletransporteFaraday rotationsquantum communicationphotons - teleportationFISICA::FISICA GERALDissertação