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Researches on Cavity-QED Based New-type Quantum Devices

Author: LaiWenXi
Tutor: LiHongCai
School: Fujian Normal University
Course: Theoretical Physics
Keywords: quantum devices cavity QED quantum information optical switching beam splitter interferometer
CLC: O431.2
Type: Master's thesis
Year: 2009
Downloads: 35
Quote: 0
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Theoretically, the system of quantum information processing has surprising ability to deal with information, which is far powerful than the counterpart of classical one, and believed to bring highly advanced age of information to human being. Because quantum information processing needs reliable hardware to accomplish effective operation of information, the exploration of quantum computer causes intensity researches on quantum optical devices. However, practically, it is difficult to realize it, since the non-classical states of quantum system are easily suffered from physical environment and destroyed by decoherence in a short period. Additionally, as quantum mechanics is absolutely different from the classical mechanics, researches are not yet proficient enough in understanding and operation of the quantum systems. Therefore, it is urgent and necessary problem in the field of quantum information to study more ideal quantum systems.In this paper, we study new-type quantum devices based on cavity quantum electrodynamics. Recent years, because of the development of technology in photonic crystal and quantum dot, the micro-cavity and cavity QED based on these solid-state materials attract great attentions of many research groups. Employing such compact sized cavity QED schemes, in the paper of my masters’degree, we study some quantum systems which have important applications in experiments of quantum optics and quantum information processing.Our researches are centered in opened cavity QED system. Opened cavity means a cavity not absolutely closed and so it can input and output photons. The character of such systems is that it is allowed to carry information by the states of photons. Because photon is free from decoherence and propagates rapidly, information processing by use of this kind of systems is more feasible and effective. In addition, they also can be applied in optical experiments as optical devices. This paper mainly shows such systems associated with micro-cavity can be used to construct single-photon switching, compact optical splitter, and interferometer. At the same time, we discuss their applications in quantum information, for example, implementing quantum logic gate, creating quantum interference, and preparing entangled states.

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