Quantum Measurement Theory
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. László Tisza, 110 anos: Origens da Física Térmica Moderna
Resumo A axiomática de László Tisza da termodinâmica é revisitada, identificada a partir de cinco elementos constitutivos, e incluída em uma perspectiva histórica. Através de uma definição de medida, uma análise detalhada da associação do formalismo de Tisza com o experimento é conduzida. A ênfase da apresentação é para a relação da axiom
Rev. Bras. Ensino Fís.. Publicado em: 10/01/2019
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2. Mecánica cuántica fundamental, una propuesta didáctica
Fundamental quantum mechanics (FQM) is a commented presentation of fundamental experiments and concepts of quantum mechanics, the physical theory of the quantum phenomena domain: superposition principle and quantum entanglement become the cornestone of the theoretical foundation of the quantum description. The formalism of these basic notions, for two-level
Rev. Bras. Ensino Fís.. Publicado em: 2014-03
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3. Descrição de medidas em sistemas de 2 níveis pela equação de Lindblad com inclusão de ambiente / Analysis of the environmental influence on the measurement process of a 2-level system using the Lindblad equation
O objetivo deste trabalho é explorar um modelo para medidas quânticas de duração finita baseado na equação de Lindblad, com a análise de um sistema de 2 níveis acoplado a um reservatório térmico que ocasiona decoerência. A interação entre o sistema e o dispositivo de medida é markoviana, justificando o uso da equação de Lindblad para obter a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/02/2012
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4. Medición cuántica y decoherencia: ¿qué medimos cuando medimos?
The problem of the preferred basis consists in accounting for the basis that defines the measured observable in a quantum measurement, given the supposed theoretical ambiguity in the definition of such an observable. The purpose of this paper is to analyze this scarcely explored problem. The final aim consists in arguing that, contrary to a widespread opinio
Scientiae Studia. Publicado em: 2010-06
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5. Classical and quantum correlations under decoherence / Correlações clássicas e quânticas sob decoerência
Recently, in the context of discrete variables, the existence of quantum correlations that are more general than entanglement was identified. We may conjecture that these correlations are a very important resource in quantum information science and in some areas of physics. However, this fragile resource is quickly destroyed by the decoherence process. In th
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/08/2009
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6. Sistemas Trinucleares Contendo Ãons LantanÃdeos
Aiming to develop new ligands capable to coordinate most of one lanthanide ions, this work shows the synthesis of trinuclear systems for photonics applications and characterization by elemental analysis, spectroscopic methods (infrared, electronic absorption and NMR of 1H and 13C). A particular study, about the new compounds synthetized, shows the substituti
Publicado em: 2006
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7. Um modelo consistente para o processo de fotocontagem contínua e medidas de emaranhamento de sistemas quânticos de variáveis contínuas.
This dissertation embraces two trends of research in modern quantum optics. The first of them is connected to the photodetection theory, particularly to the continuous measurement theory developed by Srinivas and Davies (SD) in 1980s, whose principal ingredient is the correct choice of the quantum jump superoperator. We deduce from first principles diff
Publicado em: 2005
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8. Introdução de um "Quantum" de tempo no formalismo da mecanica quantica
Discovered nearly a century ago, the electron is still a stranger in the context of classical electromagnetism. Many models have been proposed in order to describe it. In this sense, the most successful theory is the one proposed by Dirac in 1938, notwithstanding some drawbacks such as the existence of pre-accelerating and self-accelerating solutions. An alt
Publicado em: 1994
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9. P/NP, and the quantum field computer
The central problem in computer science is the conjecture that two complexity classes, P (polynomial time) and NP (nondeterministic polynomial time—roughly those decision problems for which a proposed solution can be checked in polynomial time), are distinct in the standard Turing model of computation: P ≠ NP. As a generality, we propose that each physic
National Academy of Sciences.