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Preparation and Application of Quantum Entangled States

Author: LiHongZuo
Tutor: LiChengZu
School: National University of Defense Science and Technology
Course: Physics
Keywords: Quantum Information Quantum entangled states Quantum key distribution Two-photon absorption Linear optics
CLC: O431
Type: Master's thesis
Year: 2006
Downloads: 178
Quote: 1
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Quantum information theory is developed rapidly in recent years, a new interdisciplinary , it is the product of the combination of quantum mechanics and information science . The so-called quantum information science, in essence , is a study of the quantum state encoded information science . Quantum states with non- classic phenomenon of quantum entanglement , quantum information which makes the classic information impossible to achieve the new features , such as those based on the entangled quantum key distribution , quantum teleportation , dense coding , etc. . Entanglement is a useful information resource , said the purpose of the study of quantum information to a large extent is the development and use of entanglement , and thus the study of quantum entanglement in a very meaningful thing . In this thesis, the preparation of quantum entanglement in various programs, as well as some of its applications , summarized and classification , and proposed an application of linear optical methods entangled state preparation programs . The article includes the following sections : 1 . Starting from the debate on the theory of quantum mechanics leads to the quantum entanglement in ; then prove Bell's theorem , which gives a local hidden variable theory experimentally verify ; final given the definition of quantum entanglement in several commonly entangled state and measurement problems discussed entangled state . 2 . Entangled several classic application programs : dense coding , teleportation and quantum key distribution . Summarizes the progress of entangled states in some new areas of application , several entangled quantum entangled states began to emerge from the context of basic research to practical application of the new program . 3 . Several entangled state preparation programs : trapped ions , cavity quantum electrodynamics program . (C-QED) and spontaneous parametric down-conversion program ( SPDC ) , combined with their respective characteristics analysis of the advantages and disadvantages of each option , and the SPDC program development brief introduction . 4 proposed a quantum key distribution scheme based on entangled photon source efficiency and optical components made ??presentations to analyze the efficiency of the program 's feasibility , safety , error rate , and key distribution similar programs in a selected group of parameters and the prior comparison, it can be seen that the program has more superior safety and efficiency, and the program means more simple and easy to operate .

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