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Light field with three-level atom interacting entropy dynamics

Author: JiaJinPing
Tutor: ZhuKaiCheng
School: Central South University
Course: Theoretical Physics
Keywords: Quantum Optics Light field Three-level atom Entropy Coupling coefficient
CLC: O431.2
Type: Master's thesis
Year: 2005
Downloads: 131
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Abstract


1989, such as Phoenix and Knight entropy theory is applied to the field of quantum optics research the information associated with the evolution of the interaction of the light field and the atom, showed great superiority. Entropy function automatically contains all the statistical moments of the density matrix of the quantum system, it is not only a very sensitive operation measurement of the quantum state of purity, and is also used to describe the degree of entanglement of quantum systems, but also to explain quantum system dynamics important tool, has a wide range of applications in the field of quantum information. The other hand, the study of the entanglement properties of the atom - light field of the atom, the quantum states of the light field preparation, as well as atomic and light field of quantum information and quantum computing has a wide range of applications. Over the past 15 years, the people the standard JCM as well as various the promotion forms of JCM in entropy dynamics made a lot of research. However, a common feature of these studies are: (1) atom field coupling coefficient as constant processing; (2) consider the motion of atoms and mode structure is limited to discussions of the two-level atom. From these two areas for meaningful expansion. Firstly, the use of the quantum theory, (1) Export consider atomic motion ∧ - type three-level atom with a single mode field interacting system in resonance case the wave function; With away from the resonance condition Δ gt; gt; | ω 1 -ω 2 | (Δ gt; gt; 0) deduced consider the motion of atoms and the degeneracy of the mode structure and Raman Coupling JC Model wave function; (2) export wave function into resonance and the atom - field coupling coefficient with time linear change ∨ - type three-level atom with a single mode field interacting system derived variable coupling coefficient degenerate Raman coupling the JC model wave function. Then, using PK entropy theory, the wave function with export specific discussion of the initial light field, changes in the atomic motion mode structure and coupling coefficient of the atom - field interaction midfielder (atomic) entropy of the impact. The study showed that: (1) atomic motion led to the evolution of the field entropy is cyclical, this cyclicality is not dependent on the statistical distribution and intensity of the field, but depends on the atomic motion and mode structure parameter εp; (2) whether the resonance or far can get away from the resonance of the case, select the appropriate parameters εp (selected in the experiment on the possible), pure state light field for a long time; (3) ∧ - type three-level atom with a single mode field evolution and interaction can not directly generate Schr?dinger cat state; (4) the statistical properties of the initial light field have a greater impact on the field entropy; (5) linear modulation the Field Entropy presents the perfect periodic oscillation destruction speed is slowed, when the atom - field coupling coefficient changes slowly, the atoms enter the statistical mixed state; When the atom - field decoupling

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CLC: > Mathematical sciences and chemical > Physics > Optics > The light nature of the theory > Quantum optics
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