I study the application of entangled states in quantum information processing. Firstly,we investigate the Dzyaloshinskill-Moriya anisotropic antisymmetric interaction and intrinsic decoherence on entanglement transfer.

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By the historical and methodological pondering over the development process of modern physics,based on the research work done by Arndt,Zurek,Brune,Myatt and so on,the problem of the wave-particle duality,the boundary between classic physicsand quantum physicsand the quantum decoherence of object particles is extended to the boundary of electromagnetic fields between classic and quantum in this paper.

本文通過對現(xiàn)代物理學(xué)發(fā)展過程的歷史學(xué)與方法論反思性黑人大战欧美视频免费看，在阿恩特、哲瑞克欧美一级俄罗斯a片、布魯尼中文字字幕在线播放、莫雅特等人工作的基礎(chǔ)上把實物粒子的波粒二象性、經(jīng)典物理與量子物理的界限以及量子退相干問題推進(jìn)到了電磁場的經(jīng)典與量子界面上综合自拍，并就反康普頓散射的經(jīng)典理論與量子理論進(jìn)行了比較研究，發(fā)現(xiàn)了洛侖茲-康普頓佯謬并設(shè)計了一個敏感而可行的雙勝判決性實驗免费公开超碰在线。

For this bilinear system, the optimal trajectorytracking method is used to suppress the decoherence effects brought by the environ-mental noises.

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Therefore, it is of great importance to suppress the decoherence.The thesis discusses the decoherence suppression and the corresponding entanglementcontrol problems with the help of the coherence vector representation of the densitymatrix.

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The third chapter talked about two different treatments of quantum decoherence in V〓 system. For one the decoherence factor is been expressed in the form of a random external field. And the mean density matrix is calculated to signal the decoherence by showing its nondiagonal elements to approach to zero. In another numerical work done by us, random interaction between system and environment is imposed to mimic the decoherence factor.

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Amplitude decoherence is much more sophisticated than phase decoherence. To describe its properties, we develop a method called the short-time perturbative expansions for the state fidelities. This approach is proven to be a useful tool for studying open quantum systems.

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We present a quantum error correction scheme based on quantum cloning. This scheme shows the relationship between quantum cloning and quantum error correction. 4 To avoid decoherence in quantum algorithms, we construct a decoherence-free subspace by using multiple quantum coherences.

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The phonon spontaneous emission causes the decoherence of the qubit. We discussed the relatoion between the decoherence time and the Coulomb binding parameter,the couping strength, the confinement length, and the conefficient dispersion.

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The fermion environment is considered from zero temperature to the critical temperature. It is show that the decoherence of the two-level system may also act as the witness of the environments phase transitions, which is similar to the relation between quantum phase transitions and decoherence in the former study.

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However , on the other hand, quantum information processing and quantum computing need stable coherent superposed state, then decoherence is a difficulty of realizing them, it is, therefore, an important issue to find methods for slowing down decoherence in order to stabilize the coherent superpositions in the field of quantum study.

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