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Quantum Decoherence of Excitons in Dissipative Cavity

Author: LiXiang
Tutor: ZhengTaiYu
School: Northeast Normal University
Course: Condensed Matter Physics
Keywords: Quantum Information Quantum Decoherence Density Operator Decoherence Factor
CLC: O431.2
Type: Master's thesis
Year: 2011
Downloads: 23
Quote: 0
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Abstract


Quantum mechanics is one of the most profound theories in the development of science in the 20th century, and the quantum superposition principle is one of the most fundamental principles of quantum mechanics. Quantum coherence is the most essential difference between quantum mechanics and classical mechanics. Theoretically, the ideal coherent superposition state can only exist in the quantum world without outside interference, however, a real quantum system can not completely divorced from its surrounding environment to exist independently and it is usually coupled with the outside world. The interaction between quantum system and the outside world will lead to the quantum decoherence and thus influence the storage and writing of quantum information. That is why it becomes a main obstacle in the development of quantum information science. Therefore, it is necessary to study the mechanism of the quantum decoherence and find out the effective way of restraining the quantum decoherence.This paper firstly introduces the concept and density matrix of the quantum decoherence as well as the quantum decoherence dynamics model under the macro-limit and the classical limit. And then this paper summarized the recent research on the theory and experiment development of the quantum decoherence. The author calculates the excitons’quantum decoherence under non-rotating wave approximation based on the bibliography 18th to show the relationship between the decoherence factor with the time and the initial state of excitons.

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