量子态

At the same time, theories on the construction of the generalized coherent states and realization of coset space respresentation are briefly summarized, while the concepts of quantum phase space and the classical analogy for a quantum system are derived.

同时，对一般相干态的构造理论以及陪集表象表示的实现也进行了简要的介绍，并且引入了量子相空间和量子系统的经典类比等概念。

In this paper, we describe as simply as possible the role of fidelity and its leading term, i.e.

文章简单介绍了一个量子系统的基态对系统参量的响应，即保真率，在量子相变中的行为。

In quantum computation one would need quantum logic gate which can produce entanglement efficiently.

在量子计算中我们需要能够有效产生纠缠态的量子逻辑门。

A protocol for probabilistic cloning of a class of three-qubit Greenberger-Horne-Zeilinger state and its orthogonal complement state by using three maximally two states as the qua山1m channel is proposed.

基于三个二粒子纠缠态作为量子信道，提出了一种类型的未知三粒子GHZ 态或其正交态的概率克隆方案。

In this dissertation, the squeezing properties in the system of the coherent optical field and Schrodinger cat states interacting with two

本文主要运用全量子理论和数值计算方法研究了初始处于纠缠态的两全同二能级原子与相干态及猫态光场相互作用过程中光场的压缩特性。

Using generalized Grover's algorithm of multiple marked states, and by designing a proper unitary operator, we propose a scheme for synthesizing quantum superpositions, and realize the scheme to synthesize NMR analogues of Einstein-Podolsky-Rosen states (pseudo-EPR states).

利用多标记态情况的广义Grover算法，我们通过选择适当的幺正变换，提出了合成量子叠加态的方案，并在实验上合成了赝EPR态。

The results show:(1) that the dynamical properties in the system depend on the degree of entanglement of the initial two identical two-level entangled atoms and the intensity of the coherent optical field, and the atomic dipole moment can be completely squeezed via choosing optimal degree of entanglement of the initial atoms in the feeblish optical field;(2) that the quantum properties of the system also depend on the degree of entanglement of the initial two identical two-level entangled atoms and the intensity of the coherent optical field, and the radiation field can be effectively squeezed via choosing optimal degree of entanglement of the initial atoms in the feeblish optical field.

结果表明：(1)相干态光场的强度和两原子的初始纠缠度对原子的动力学行为有很大的影响。原子布居的振荡频率及幅度和原子偶极压缩的演化规律与光场强弱和两原子初始纠缠度相关联。在弱光场下，选择合适的两原子初始纠缠态，原子偶极矩可以完全被压缩。(2)相干态光场的强度和两原子的初始纠缠度对光场的量子特性也有很大的影响。光场的二阶相干性质和光场的压缩效应均与光场强度和两原子纠缠度相关联。在弱光场中，选择合适的两原子初始纠缠度，光场压缩深度和时间可达到最大。

Chapter 3 is devoted to the derivation of the master equation for the system. We find that the depasing time T2Q PCis about 100 ns when the spin decoherence is only induced by the QPC, and the repeated QPC measurement will slow down the transition rate between spin states which can be interpreted in terms of quantum Zeno effect.Meanwhile, we also study the effect of QPC measurement on two-electron spin state in double quantum dot system.

推导了系统的有效哈密顿量以及主方程、计算了测量过程中电子自旋态的演化行为；随后通过计算分析，我们发现QPC测量引起的退相干时间T2Q PC约为100ns以及高频重复的QPC测量会减缓电子自旋态之间的演化、局域系统在其初态，表现出量子Zeno效应。

Since the mechanism and form of gluon confinement have not been known clearly, certain phenomenological models have to be used in many previous works.

实验上的困难主要在于，基态胶球所处的能量区域同时也是强子态非常丰富的区域，而具有相同量子数的胶球与强子态之间可能存在的混合使对胶球的识别更为困难。

Inthe first scheme, an arbitrary two-qubit quantum state can be probabilistically teleported fromthe sender to the receiver.

第一种方案采用非最大纠缠的G态之一作为量子信道，实现了对任意两体量子态的概率隐形传态。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。