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Master's Dissertation
DOI
10.11606/D.76.2009.tde-19032009-160506
Document
Author
Full name
Jader de Souza Cabral
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2009
Supervisor
Committee
Marcassa, Luis Gustavo (President)
Mendonça, Cleber Renato
Oliveira, Andre Luiz de
Title in Portuguese
Ressonâncias Moleculares em átomos de Rydberg frios
Keywords in Portuguese
Átomos de Ryderd frios. Ressonâncias moleculares. Transferência de população. Estados nD.
Abstract in Portuguese
O entendimento das interações de ultralongo alcance envolvendo átomos de Ryberg frios é o ponto principal para o uso deste sistema em computação quântica. Neste trabalho estudamos tais interações envolvendo estados nD+nD em um novo aparato experimental, o qual permite o controle de campo elétrico de uma forma mais eficiente. Mais especificamente estudamos o processo colisional $nD + nD$ $ightarrow$ $(n+2)P + (n-2)F$ na presença de campo elétrico estático fixo. Este processo é importante porque pode levar a decoerência da amostra. Os resultados obtidos indicam a existência de uma ressonância molecular que é sensível ao efeito Stark. Além disso, investigamos se o movimento atômico é importante para popular tais estados. Por fim, proporemos novos experimentos que podem ser úteis para controlar e suprimir tais processos colisionais e assim permitir avanços na área de computação quântica com tais sistemas.
Title in English
Molecular ressonances in cold Rydberg atoms
Keywords in English
Cold Rydberg atoms. Molecular ressonances. Population transfer. nD states.
Abstract in English
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 $nD + nD ightarrow (n+2)P + (n-2)F$ in the presence of a static electric field. This process is important because it can lead to a decoherence of the sample. The observed results show the existence of a molecular resonance which is dependent of Stark effect. Moreover, the atomic motion is perhaps also important to populate such states. Finally, we propose new experiments that can be useful to control and to suppress theses colisional processes and in this way allows us to move on in quantum computing area with such systems.
 
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Publishing Date
2009-03-23
 
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