Control Of Quantum Systems
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. In silico Evaluation of Cucurbit[6]uril as a Potential Detector for Cocaine and Its Adulterants Lidocaine, Caffeine, and Procaine
Illicit drugs and their trafficking require worldwide efforts in investigation, detection, and control. Colorimetric tests are often applied to identify drugs. Cocaine has some well-known adulterants that can provide a false positive response. Cucurbit[6]uril (CB[6]) has been suggested as a potential detector for cocaine and other illicit drugs. This work us
J. Braz. Chem. Soc.. Publicado em: 2021-04
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2. Resolvendo a equação de Schrödinger utilizando procedimentos numéricos fundamentais
A combination of the variational principle, expectation value and Quantum Monte Carlo method is used to solve the Schrödinger equation for some simple systems. The results are accurate and the simplicity of this version of the Variational Quantum Monte Carlo method provides a powerful tool to teach alternative procedures and fundamental concepts in quantum
Quím. Nova. Publicado em: 2012
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3. Controle de Corrente de Spin em Pontos Quânticos na Presença de Tensões de Porta Moduladas no Tempo
Since Loss &DiVincenzo proposal to use confined electron spins in quantum dots (QDs) as a building block for qubits in solid state systems, spin-dependent transport in QDs has attracted a lot of attention. The interest for this system increased even further with the recent experimental developments to coherently control (initialization-manipulation-read out)
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/08/2011
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4. Triangular forms for nonlinear systems with two inputs and control of driftless systems on SU(n) with applications in quantum mechanics. / Formas triangulares para sistemas não-lineares com duas entradas e controle de sistemas sem arrasto em SU(n) com aplicações em mecânica quântica.
A presente tese aborda dois problemas distintos e independentes: triangularização de sistemas não-lineares com duas entradas e controle de sistemas sem arrasto que evoluem no grupo especial unitário SU(n). Em relação ao primeiro, estabeleceu-se, através da generalização de resultados bem conhecidos, condições geométricas para que um sistema com d
Publicado em: 2010
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5. Molecular ressonances in cold Rydberg atoms / Ressonâncias Moleculares em átomos de Rydberg frios
The understanding of ultralong-range interaction involving cold Rydberg atoms is the main step for use this system in quantum computation. In this work, we have studied interaction involving $nD$ states in a new experimental setup, which allows us to control the electric field in a more efficient way. More specifically, we have studied the collision process
Publicado em: 2009
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6. InformaÃÃo quÃntica e emaranhamento: uma abordagem usando Ãlgebra geomÃtrica
We studied the quantum entanglement as a quantum computation and quantum information tool. This research focused on the bipartite entanglement found between two qubits of a Heisenberg hamiltonian. The choice of this hamiltonian was motivated by the fact that it can be simulated by many distinct physical systems. Besides, the control of its parameters during
Publicado em: 2007
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7. DISSIPAÇÃO EM MODOS ACOPLADOS
The implementation of processes of Quantum Computation as well as the transmission and quantum information control in realistic physical systems, must take in account the effects of the coupling of the systems with the environment, represented by thermal reservoirs. In this work it is considered the study of the effects of the environment in the quantum prop
Publicado em: 2007
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8. Fases geométricas e invariantes dinâmicos em mecânica quântica
The increasing interest to understand the geometric phases (mainly due to the possi- bility to achieve geometric quantum computation robust against some kind of errors) and the search for new techniques to solve time-dependent problems in Quantum Mechanics, are the topics approached in this thesis. i) Within nowadays technology, it is presented a scheme to c
Publicado em: 2007
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9. Controle coerente em Ãtomos de Rb por manipulaÃÃo da fase de pulsos ultracurtos
Coherent quantum control aims to drive a quantum system towards a desired final state. Nowadays its study is widely employed to manipulate transitions in atomic systems, to break molecular bonds and to optimize the output of chemical reactions, for instance. In this thesis experimental and theoretical results of partial temporal coherent control in two diffe
Publicado em: 2005
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10. SPIN AND CORRELATION EFFECTS IN NANOSCOPIC TRANSPORT / EFEITOS DE SPIN E CORRELAÇÃO EM TRANSPORTE NANOSCÓPICO
We investigated spin polarized transport properties through a quantum dot connected with two terminals. An electric current that circulates in our system can have its polarization modulated with an external potential that controls the spin orbit coupling (Rashba effect). We studied the effect of spin polarization n a transistor constituted by a quantum dot w
Publicado em: 2005
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11. Aspectos dinamicos de sistemas quanticos abertos
Dynamical aspects of three open quantum systems are examined. In the problem of quantum particle trapping by oscillating fields there is the evidence of movement stabilization and the quadrature-squeezing degradation for the quantum particle, due to the dissipative action of the environment over the particle. In the problem of information transfer occuring i
Publicado em: 1999
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12. Quantum dot artificial solids: Understanding the static and dynamic role of size and packing disorder
This perspective examines quantum dot (QD) superlattices as model systems for achieving a general understanding of the electronic structure of solids and devices built from nanoscale components. QD arrays are artificial two-dimensional solids, with novel optical and electric properties, which can be experimentally tuned. The control of the properties is prim
The National Academy of Sciences.