我们主要讨论形成纠缠度。
给出了直积态纠缠度为零的一个简单证明。
A simple Proof is given that the entanglement of kronecker Product state is zero.
结果表明修订的几何纠缠度是合理的纠缠度量。
The results indicate RGME is an appropriate measure of entanglement.
本学位论文研究了量子态的可分性和形成纠缠度。
We investigate separability and entanglement measure for quantum states.
数值计算了相对熵纠缠度和计算分析了线性熵纠缠度。
We numerically calculate the relative entropy of the entanglement and analyze in detail the linear entropy of the entanglement.
而随着压缩参量的增大，原子与光场的纠缠度逐渐增大。
However, an increase of squeezing factor of light strengthen the degree of entanglement between the atoms and the light field.
最后得出了重要结论，光场压缩与两原子纠缠度有很强的关联。
And we draw a conclusion that the squeezing of two optical fields is very dependent on the degree of entanglement.
可增加或减弱双模相干光场间纠缠度，但无法使双模间完全退纠缠。
The entanglement of the two-mode field will increase or decrease, but it's impossible to disentangle completely.
在磁场保持不变的情况下，纠缠度的时间演化呈现周期性变化的正弦函数形式。
If the magnetic field is fixed, the time evolution of the entanglement is periodic and is a sinusoidal function.
研究一个体系时分析它的纠缠度，讨论最大纠缠态出现的条件也是很有必要的。
It is always to be used to analyze the maximal entangled states as one writes the explicit form of the entropy.
第三章，我们提出修订的几何纠缠度，并讨论了离散和连续变量的的纠缠态系。
In Chap 2, the revised geometric measure of entanglement (RGME) is presented, applying it into the discrete and continuous variable systems.
分别在铁磁和反铁磁模型中研究了三自旋相互作用和温度对两自旋纠缠度的影响。
The effects of the three spin interaction and temperature on the entanglement are discussed in both ferromagnetic and anti-ferromagnetic cases.
研究结果表明：在失谐量等于拉比频率时，该体系的纠缠度将长时间处于最大纠缠态。
It is shown that the quantum entanglement state will stay in the maximally entangled state for a long time when the detuning is equal to rabi frequency.
所得结果表明，双原子初态的纠缠度对压缩的持续时间和压缩深度具有决定性的影响。
The results show that the initial entanglement of atoms and initial intensity of field as well affect intensively both time and depth of field entropy squeezing.
当粒子数增多时，纠缠依然呈现周期性的变化，但是次近邻粒子会对纠缠度产生影响。
When number of spins increases, the entanglement is also periodic but the next-nearest neighbor will affect the entanglement.
当磁场较大时，磁场的影响超过了次近邻粒子的影响，纠缠度又出现了有规律的、周期性的变化。
When the magnetic field is very large, the effects of the magnetic field exceeds that of the next nearest neighbor, the entanglement becomes again regular and periodic.
研究结果表明，双原子纠缠度影响场熵的平均值，而初始光场的强度则影响场熵演化的振荡特性。
The results show that the entanglement of atoms affects the mean-value of field entropy and the intensity of field affects the oscillation properties of field entropy evolution.
本文研究了两个二能级原子与单模真空场相互作用系统中的量子纠缠度，得到了一些有意义的结论。
In this thesis, the degrees of the quantum entanglement in the system of two two-level atoms interacting with a single mode vacuum field are explored, and a series of significant results are obtained.
研究两粒子的XYZ海森伯模型的热纠缠态，并讨论了这个系统哈密顿量中的参数和温度对纠缠度的影响。
In this paper, study the thermal entanglement of a two-qubit XYZ Heisenberg model, and show the influences for the concurrence of this system in terms of the parameters of the Hamiltonian and t.
分析原子的纠缠度对约化后光场性质的影响，结果表明纠缠度强烈影响光场的平均光子数分布和二阶量子相干性。
It is proved that the average photon Numbers and the second-order quantum coherence are dramatically influenced by the entangled degree of the atoms.
用量子约化熵研究了单模真空场与双原子相互作用的纠缠特性，讨论了原子偶极—偶极相互作用对其纠缠度的影响。
The entanglement of field-atom and the entanglement between the two-mode field are investigated using the quantum reduced entropy and quantum relative entropy, respectively.
当磁场也发生变化时，发现当磁场较小时，次近邻粒子对纠缠的影响超过磁场对纠缠度的影响而且呈现出不规律的现象。
When the magnetic field is varied with small magnetic field, the effects of the next nearest neighbor exceeds that of the magnetic field, the entanglement appears irregular behavior.
用量子相对熵研究了耦合双原子与单模真空场相互作用系统的纠缠度，讨论了原子间偶极相互作用对相对熵纠缠度的影响。
The entanglement degrees of two coupling-atoms interacting with a single-mode vacuum field in the Tavis-Cummings model were investigated by using quantum relative entropy.
结果表明，三自旋相互作用提高系统的两体纠缠度，但是提高程度会因最近邻自旋间发生铁磁、反铁磁相互作用而有所差异；
Our results show that three spin interactions enhances the entanglement of the system, but the extent is difference for ferromagnetic and anti-ferromagnetic cases.
自旋压缩系数除了可以作为纠缠判据外，在某种特殊的状态下，还和并发度存在着比较简单的函数关系。
In addition to spin squeezing coefficients can be used as entanglement criteria, in certain types of special state, it also has relatively simple relationship with concurrence.
应用全量子理论研究了初始处于纠缠态双原子与二项式光场共振相互作用的光场量子信息保真度。
Quantum theory is used to study the fidelity of quantum information of binomial light field interacting with pair atoms of entanglement state.
应用全量子理论研究了初始处于纠缠态双原子与二项式光场共振相互作用的光场量子信息保真度。
Quantum theory is used to study the fidelity of quantum information of binomial light field interacting with pair atoms of entanglement state.
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