superconducting quantum bits ( qubits), based on the non-linear effect of superconducting josephson junctions and the semiconductor integrate technique, are promising for quantum computing due to their low dissipation, large design-fabrication freedom, and relatively ease of scaling up.

the procedure is as follows: after the modeling of the electron quantum bit system and the control field, applying the lie-algebra, the control output is calculated by analogy with the classical optimal control method to achieve the target.

建立了该量子比特系统及其控制场的模型，借助李群李代数，由经典最优控制的思想来获得最优控制，从而实现了电子自旋量子系统任意量子态的最优制备。

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based on a magnetic field controlled electron spin quantum system, utilizing the mechanism of realizing the unitary evolution of the quantum state through the quantum gate, an optimal control strategy to prepare an arbitrary quantum state is proposed.

针对以磁场为控制场的电子自旋量子比特系统，结合量子门实现量子态幺正演化的量子态调控机制，提出了一种量子比特系统任意量子态的最优制备策略。

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the theoretical models based on an ideal single-photon source and a single-photon source with poisson distribution are established by introducing the measuring factor and the shifting factor, and the expressions of quantum bit rate are given.

通过引入测量因子和筛选因子，建立了基于理想单光子源和泊松分布单光子源的量子比特率理论模型，给出了量子比特率的表达式，并对两种单光子源进行了比较分析。

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using the method of pattern recognition and looking upon every encoding state of quantum information systems as a quantum information pattern, this thesis presents two clustering and recognition algorithms based on pattern-distance.

利用模式识别方法，将每个量子比特编码状态看作一个量子信息模式，提出了基于模式距离的聚类和识别算法。

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such kind of cavities not only constitute the quantum computation circuits with strong coupling but also provide a new way in the research of quantum electrodynamics ( qed).

它不仅能够与超导量子比特形成强耦合组成量子计算电路，也为量子电动力学的基础研究提供了新的方案。

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in the paper, a new definition of q-bit expression called quantum angle is introduced, and the particle swarm optimization is employed to update the quantum angles automatically.

在文中，通过引入一种新的量子比特位表示&量子角，并使用粒子群算法自动更新量子角大小。

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base on our conclusion, one may realize quantum computation and get the most favourable entanglement by effective control on quantum bit through external magnetic field's adjusting.

在此基础上，可以通过对外加磁场的调节对量子比特进行有效的控制，实现量子计算和得到最有利的纠缠。

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the discreteness of the braid topology suggests that we introduce geometric errors into redundant degrees of freedom and thus we obtain low-leakage topological quantum computation.

辫子拓扑的离散性启发我们对冗余自由度引入几何误差，从而得到低泄漏的双量子比特门。

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if the quantum bit error rate caused by eve is smaller than the threshold, eve will not be discovered by alice and bob.

当窃听行为在接收方引起的量子比特误码率小于门限值时，窃听者不会被发现。

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this algorithm codes the chromosomes in the way of quantum bit probability, and makes the population evolve by the operation of quantum gate.

该算法采用量子比特概率编码方式构造染色体，由量子旋转门操作实现种群进化。

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by external field, the effective manipulation of superconducting quantum bit is a necessary precondition to implement quantum computing in superconducting system.

利用外场对超导量子比特的有效操控是实施超导量子计算的必要前提。

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it is the superconducting quantum interference device as two-level system approximately operating in a particular state.

超导量子比特是工作在特定条件而可以近似看作二能级体系超导量子干涉仪。

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the paper also proposes a scheme for realizing the multi-purpose quantum cloning machine.

在本论文中，还设计了另一个利用超导干涉器件作为量子比特实现多用途量子克隆机的方案。

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optimal preparation of quantum state of quantum-bit system taking magnetic field as controlling field

以磁场为控制场的量子比特系统量子态的最优制备

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at first, a fuzzy neural network ( fnn) model is presented by combining fuzzy computation with neural networks. then, a quantum particle swarm algorithm based on phase encoding of quantum bit is presented, which is applied to optimize parameters of fnn models.

通过将模糊计算与神经网络相融合，首先提出一种模糊神经网络（FNN）模型，然后提出一种基于量子比特相位编码的量子粒子群算法，用于优化FNN的模型参数。

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we also propose a scheme to implement two-bit quantum phase gates and one-bit unitary gates by using the two-mode two-photon jaynes-cummings model. the entangle-ment between the atom and cavity is also investigated in the presence of phase decoherence.

利用两模两光子JC模型还可以实现单量子比特幺正门和两量子比特相位门。我们还进一步研究了三能级原子和腔场相互作用体系的纠缠产生和操控问题。

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the feature of symmetric canonical form and the relation between the lu polynomial invariants and slocc classification in pure three-qubit case are presented at first.

首先介绍了三量子比特纯态情形对称正则形式的特点和LU多项式不变量与随机LOCC分类的关系。

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we study the thermal entanglement in the two-qubit anisotropic xxz model in the presence of an external inhomogeneous magnetic field along the z axis.

研究了存在沿Z轴方向的非均匀磁场作用下两量子比特各向异性XXZ模型中的热纠缠。

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the decoherence time decreases as the capacitance increase. ( 4) we found the relations between the field-dependent decoherence time and the intrinsic decoherence time.

消相干时间随电容C1的增大而减小。（4）得出了驱动场导致的消相干时间和量子比特本征消相干时间之间的关系。

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so we can fulfill the process of quantum information.

利用腔QED系统可以实现原子量子比特和光子量子比特之间的转变，从而完成量子信息过程。

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