Entangled States
Mostrando 1-12 de 12 artigos, teses e dissertações.
-
1. Geometria e simetrias do emaranhamento
In the present work we present a geometric method to identify and measure the degree of entanglement of a two-qubit state. It is based on writing a map of the system state, from a non-unitary transformation. By introducing new parameters for such 4X4 matrix, the product of eigenvalues, two by two, acquire the form of squared 4D distances, having a Minkowski
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/05/2011
-
2. Geração e proteção de estados comprimidos do campo e estados atômicos emaranhados em cavidades ópticas
In this work we investigated the engineering of interactions and reservoirs in the context of Cavity Quantum Electrodynamics. The investigated system consists of two identical three-level atoms trapped in two distinct traps, but inside the same optical cavity, inte- racting with the cavity mode and driven by classical .elds to manipulate the atom-.eld intera
Publicado em: 2010
-
3. Redes de osciladores dissipativos : o modelo duplicado de Caldeira-Leggett, transferência quase-perfeita de estados e recoerência
In this work we treat firstly what we call the double Caldeira-Leggett model, which consists on the approach to the dynamics of two dissipative harmonic oscillators via Feynman-Vernon theory. We derived and solved the associated master equations in two different situations where i) each oscillator is coupled to its own reservoir and ii) both oscillators are
Publicado em: 2010
-
4. Analise e geração de emaranhamento em sistemas de variaveis discreta e continua via atomos / Analysis and generation of entanglement in systems of continuous and discrete variables via atoms
In this thesis, we present two results of entanglement generation, both involving atom-radiation interaction. In the first part, we consider a scheme for generation of entangled states involving electronic states of two distant ions, each one placed in a cavity. A flying atom, that crosses these cavities, is responsible for the generation of entangled states
Publicado em: 2009
-
5. Perda de coerencia e teletransporte em eletrodinamica quantica de cavidades / Decoherence and teleportation in cavity quantum electrodynamics
In this work, we analyze concepts of Quantum Information and Quantum Optics in the context of Cavity Quantum Electrodynamics (CQED). Nowadays, CQED is achieving great technological advances, justifying the interest in several proposals of experimental implementation. In the first part of the work, we consider the effect of spontaneous emission in a system of
Publicado em: 2008
-
6. Tripartide entangled states with one qubit / Estados emaranhados quânticos tri-partidos com um qubit
Estudamos o emaranhamento quântico de estados puros emaranhados tri-partidos quando uma das partes é um qubit. Apresentamos um método para encontrar as decomposições do estado tri-partido mais simples do que sucessivas decomposições de Schmidt. Esse método permite encontrar uma grande quantidade de diferentes famílias de estados emaranhados tri-part
Publicado em: 2008
-
7. The quasi-degenerative Raman model and entanglement reciprocation / O modelo Raman quase-degenerado e transferencia de emaranhamento
The main purpose of this dissertation is to study a new model to describe the interaction between an atom and a mode of the quantized electromagnetic field and also its application to the entanglement reciprocation problem between qubits and continuous variable systems. Firstly, we review the main model used to describe the atom field interaction,known as th
Publicado em: 2008
-
8. Quantum entanglement between atoms located in distinct cavities / Emaranhamento quantico entre atomos localizados em cavidades distintas
In this work, we study the dynamics of the entanglement between two remote atoms in distinct cavities. The main focus is the production of maximal entangled states between identical atoms of two levels in distinct cavities and, in particular, coupled cavities. Initially we present the main concepts of the Theory of Quantum Information, qualitative and quanti
Publicado em: 2007
-
9. Propriedades fisicas de operações gaussianas sobre estados gaussianos emaranhados / Physical properties of gaussian operations over entangled gaussian states
We study quantum Gaussian states and the physical properties associated to operations over such class of states, which preserve the respective Gaussian nature. General properties of global covariance matrices representing two-mode bipartite Gaussian states can be decomposed into properties of local covariance matrices and their Schur complements. We demonstr
Publicado em: 2007
-
10. Propriedades fisicas de operações gaussianas sobre estados gaussianos emaranhados / Physical properties of gaussian operations over entangled gaussian states
Estudamos estados Gaussianos quânticos e as propriedades físicas associadas a operações sobre tal classe de estados que preservam a sua natureza Gaussiana. Propriedades gerais de matrizes de covariância globais representando estados Gaussianos bipartidos de dois modos podem ser decompostas em propriedades de matrizes de covariância locais e seus comple
Publicado em: 2007
-
11. Manipulação de estados quanticos da luz via espelhos semi-transparentes
Not informed
Publicado em: 2004
-
12. Quantum optical implementation of Grover's algorithm
We present a scheme for a quantum optical implementation of Grover's algorithm based on resonant atomic interactions with classical fields and dispersive couplings with quantized cavity fields. The proposed scheme depends on preparation of entangled states and is within current state-of-the-art technology.
National Academy of Sciences.