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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Geradores Quanto-Ãpticos de NÃmeros AleatÃrios / Generators-Optical Random Number

Emanoela de Jesus Lopes Soares 22 February 2013 (has links)
nÃo hà / Geradores quÃnticos de nÃmeros aleatÃrios (GQNA) tÃm importantes aplicaÃÃes em protocolos criptogrÃficos, jogos e loterias, entre outros. Em contraste com geradores de nÃmeros pseudoaleatÃrios baseados em software, a sequÃncia de nÃmeros gerada à verdadeiramente aleatÃria. A maioria dos GQNA encontrados na literatura à baseado em dispositivos optoeletrÃnicos, como fontes de fÃtons Ãnicos e detectores de fÃtons. Nesta direÃÃo, a presente dissertaÃÃo trata da teoria e experimento de GQNAs baseados em sistemas fotÃnicos, considerando geradores com variÃveis discretas e contÃnuas. Em particular, trÃs problemas foram considerados: 1) um novo modelo de GQNA de variÃvel contÃnua utilizando a polarizaÃÃo da luz foi proposto. 2) a anÃlise de desempenho de um GQNA usando apenas um detector de fÃtons, levando em consideraÃÃo o afterpulsing e o tipo de estado quÃntico da luz utilizado, coerente ou tÃrmico, foi realizada. 3) um GQNA com distribuiÃÃo binomial foi construÃdo. / Quantum random number generators (QRNG) have important applications in cryptographic protocols, gaming and lotteries, among others. In contrast to pseudo-random number generators based on software, the sequence of random numbers generated is truly random. Most QRNG found in the literature are based on optoelectronic devices like single-photon sources and single-photon detectors. In this direction, the present dissertation deals with the theory and experiment QRNG based photonic systems, taking into account QRNG using discrete and continuous variables. In particular, three issues were considered: 1) a new model of continuous variable QRNG based on light polarization was proposed. 2) The performance of a QRNG employing only one single-photon detector, taking into account the afterpulsing and the quantum light state used, coherent or thermal, was realized. 3) A QRNG with binomial distribution was built.

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