Interacting Atoms
Mostrando 1-12 de 20 artigos, teses e dissertações.
-
1. Superradiance pulse manipulation via atomic interactions / Manipulação do pulso superradiante via interações atômicas
O fenômeno da superradiância é caracterizado por um processo de ordenamento das transições dos dipolos atômicos em amostras excitadas, moderadamente densas, decorrente das correlações induzidas entre os átomos desenvolvidas pela radiação coerente emitida pelos próprios átomos. O processo superradiante que é iniciado a partir de uma total desord
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
-
2. Efeitos coerentes no acoplamento dos lasers de fentosegundo e de diodo em vapor de rubÃdio
Mode-locked, phase-stabilized femtosecond (fs) lasers with high-repetition rate produce a frequency standard composed by a great number of narrow modes, known as frequency comb. The interaction of inhomogeneously broadened two-level systems with a train of fs pulses, for the case in which the atomic relaxation times are longer than the laser repetition perio
Publicado em: 2008
-
3. 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
-
4. 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
-
5. Um estudo teórico relativo à não-linearidade da ligação de hidrogênio em sistemas heterocíclicos C2H4O-C2H2 e C2H4S-C2H2
B3LYP/6-31G(d,p) calculations were used to determine the optimized geometries of the C2H4O-C2H2 and C2H4S-C2H2 heterocyclic hydrogen-bonded complexes. Results of structural, rotational, electronic and vibrational parameters indicate that the hydrogen bonding is non-linear due to the pi bond of the acetylene interacting with the hydrogen atoms of the methyl g
Química Nova. Publicado em: 2007-10
-
6. 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
-
7. Silicon adsorption in single walled nanotubes
Using density functional (DF) calculations and Monte Carlo (MC) simulations we have investigated the main electronic and structural properties of silicon interacting with single walled carbon nanotubes. We have investigated the silicon adsorption externally and internally in the nanotubes surface. The total energies calculations and charge density plot prese
Brazilian Journal of Physics. Publicado em: 2006-09
-
8. Monitoramento de propriedades de condensados de Bose-Einstein interagindo não ressonantemente com campos óticos via detecção contínua de fotóns
In this work we consider an of - resonant interaction between optical fields and a Bose - Einstein condensation. We used a continuous photo detection model to study the efects of the counting of k photons of the optical field upon the properties of the atoms in the condensate. We have obtained the density operator of the interacting system conditioned to cou
Publicado em: 2006
-
9. ConfiguraÃÃo, anisotropia e defeitos em uma rede de vÃrtices na presenÃa de nanoarmadilhas
Since Abrikosov s work in 1957, it. has been clear the vortex lattice existence and stability in specific magnetic fields and temperature values of type ll super- conductors. On external currents and Thermic fluctuations, vortices move through the superconductor salable resulting thermal dissipation. But it is salvage to most. actual technologic applications
Publicado em: 2006
-
10. Estudo dos efeitos de colisões atômicas na dinâmica, nas propriedades estatíticas e no emaranhamento entre átomos aprisionados interagindo com a luz.
In this work we consider a trapped Bose-Einstein Condensate interacting simultaneously with a high quality cavity quantized field and a classical undepleted laser field. Collisions between atoms are taken into account by a delta type contact potential. A linearized model is obtained which take into account simultaneous amplification of atomic and optical fie
Publicado em: 2005
-
11. Transferencia de coerencia atomo-campo em um micromaser de dois fotons
The construction of pure states of the electromagnetic field is important not only for the study of the foundations of the quantum mechanics, such as the question of the Schrõdinger cat states, but also for its potential applications, for example, in quantum computation, quantum criptography and in higher precision measurements. In this thesis, we present t
Publicado em: 2003
-
12. Aplicação das funções de quase-probabilidade no estudo da dinamica de emaranhamento
Entanglement dynamics of two ideal bipartites systems is analyzed using reduced linear entropy and quasiprobability distribution functions in the semiclassical regime.Two models are studied: the quartic bidimensional oscillator and the Dicke ?s Maser model. The first one describes the propagation of two monochromatic field modes in a Kerr medium, and the sec
Publicado em: 2003