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The Effect of Quantum Disspation on Dynamics of the Two-levels System

Author: XueXiaoLi
Tutor: LiWeiDong
School: Shanxi University
Course: Condensed Matter Physics
Keywords: Master-equation Phase dissipation Particle disspation
CLC: O469
Type: Master's thesis
Year: 2011
Downloads: 18
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Abstract


The effects of quantum dissipation on dynamics of quantum systems is one of the most important contexts in quantum theory. Generally, the quantum dissipation denotes the enviorment interacted with the quantum systems. While, for quantum degenerate ultra-cold atoms gases, it is one quantum open system due to the coexist with the hot atoms, the atom number losses from the two and three body collision. That is why it is becoming one hot topic to understand how quantum dissipation make their effects on its quantum dynamics. Recently, works demonstant that the quantum disspation could enhance the coherence of the system, under one special conditions. In thesis, we studied the dynamics properties of one two-levels nonlinear system including particle and pgase disspation. In the linear case, one exact solution for solution for the dynanmics evolution of the system was obtained and the numerical simulation supported our results. We found that the phase dissipation makes a clear effect on the contrast and purity of the system, while, both including the phase and particle dissipation may enhance its contrast and purity. For three-levels system, one dynamical self-consistent equation are presented by introducing eight pasudo-spin operators.

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CLC: > Mathematical sciences and chemical > Physics > Condensed Matter Physics
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