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Master's Dissertation
DOI
10.11606/D.43.2009.tde-17032010-092745
Document
Author
Full name
Hélio Zhang He
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2009
Supervisor
Committee
Martinelli, Marcelo (President)
Araujo, Luis Eduardo Evangelista de
Teotonio Sobrinho, Paulo
Title in Portuguese
Construção de uma armadilha magneto-ótica para aplicações em informação quântica e física atômica
Keywords in Portuguese
Física atômica
Física Experimental
Ótica Quântica
Abstract in Portuguese
Construímos uma armadilha magneto-ótica (MOT) para átomos de rubídio visando o seu aprisionamento em um potencial periódico formado por feixes de luz (rede ótica) e a realização de experimentos em física atômica, com possíveis aplicações no campo da informação quântica. A necessidade de uma MOT vem dos problemas que o movimento térmico dos átomos impõem à realização de medidas precisas. Neste arranjo, combina-se a pressão de radiação de feixes laser com o efeito do campo magnético para resfriar e aprisionar átomos neutros. Durante a execução deste projeto, construímos os lasers e o sistema eletrônico de controle de frequência, intensidade e temperatura; montamos o sistema de bombeamento de vácuo e a câmara de vácuo onde é feito o aprisionamento; fizemos os arranjos para caracterizar a MOT, usando programas de computador para capturar e analisar as medidas. Caracterizamos a nuvem de átomos frios obtida, estimamos o número de átomos aprisionados, o tempo de carregamento e a temperatura da nuvem.
Title in English
Construction of a Magnet-Optical Trap for Aplications at Quantum Information and Atomic Physics
Keywords in English
Atomic Physics
Experimental Physics
Quantum Optics
Abstract in English
We built a magneto-optical trap (MOT) for rubidium as a first step for the trapping of a cloud of cold atoms in a periodic potential formed by light beams. This system will be used for experiments in atom physics, with possible applications in quantum information. A MOT is necessary to avoid the problems imposed by the thermal agitation of the atoms to the measurement of their properties. In this configuration, we combine the radiative pressure of laser beam with the effect of a magnetic field to cool and trap neutral atoms. During the execution of this project, we built the lasers and the electronic system for their control of frequency, intensity and temperature. We also built the system for vacuum pumping and the vacuum chamber for the trapping, as well as the setup for the MOT characterization, with computer programs for capture and analyze the measurements. We characterize the cold atoms cloud, measuring the number of trapped atoms, their loading time in the MOT and their temperature.
 
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Publishing Date
2010-05-12
 
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