密度矩阵

约化密度矩阵中的N表示问题

N - representability Problem in the Reduced Density Matrix

应用密度矩阵理论，研究了光子晶体中光子通过N个二能级原子的偶极&偶极共振相互作用（RDDI）的跳跃传导。

The density matrix theroy is used to study photon-hopping via resonance dipole-dipole interaction in photonic crystals .

具有密度矩阵Q的马尔科夫过程（Ⅱ）

Markov Processes with Density Matrix Q ( ⅱ )

密度矩阵理论在动态NMR中的应用

The applications of density matrix theory to dynamic NMR spectroscopy

本文讨论q阶约化密度矩阵和相应的自然轨道的一般性质。

The general natures of the arbitrary order reduced density matrix and the relevant natural orbital have been researched .

采用密度矩阵方程，在引入激光场线宽的条件下，计算了N型四能级原子系统中介质对探测场的吸收。

Using density matrix equation , the Absorption of the probing field in N-type four-level atomic system with three coupling laser-fields under introducing laser field linewidth is calculated .

运用密度矩阵方程描述了Na原子系统在激发光场作用下的粒子布居分布情况和电离速率间的关系。

The relation between the population distribution of the atomic Na excited by light field and ionization rate is described by the density matrix equation .

本文用量子力学中的密度矩阵算符理论导出了Po¨schl-Teller势阱中的光整流系数的解析表达式。

Analytical expression of the optical rectification in the Po ¨ schl Teller well is obtained by the density matrix method .

本文通过求解热库中有源LC电路的密度矩阵方程，研究电路状态的时间演化及其稳态特性。

The time-dependent properties and the steady state features of a quantum LC circuit with a source in a thermal bath are studied .

为了提高放射治疗计划中的剂量计算效率，通常要将CT数据给出的密度矩阵作插值运算进行体元粗化。

To improve the computational efficiency in radiotherapy treatment planning , a procedure usually applied is to interpolate the density matrix from CT data of fine voxels to create a density matrix of coarse voxels .

内容包括密度矩阵的基本理论，以及密度矩阵理论在分子内和分子间交换体系的NMR线型计算中的应用。

The paper consists of the basic theory of DM and the applications of DM theory to NMR line-shape calculations of inter - and intra-molecular exchanging systems .

J-C模型非微扰约化密度矩阵主方程

Non-perturbation Master Equation for the Reduced Density Matrix of the J-C Model

作为密度矩阵一种形式的Wigner函数是量子相空间里的分布。

As a form of density matrix , the Wigner function is the distribution in quantum phase space .

文中指出：（1）在梯度脉冲作用之后，密度矩阵将留下z分量、零量子相干和双量子相干。

It is shown that ( 1 ) after applying of gradient pulse , a z-component , a zero-quantum coherence and a double-quantum coherence will be left in the density matrix ;

利用密度矩阵方法在裸态和缀饰态中研究了在外场引起原子相干的v型寿命自加宽能级系统中产生无反转激光的条件。

The conditions for realizing lasing without inversion are investigated via density matrix method in bare and dressed states in the V-type closed lifetime-broadened system where atomic coherence is induced by an external electromagnetic field .

对具2n个电子的多原子体系，其一阶约化密度矩阵可用n个基求解HFR方程的方式构出。

The first order reduced density matrix ρ _1 for a polyatomic system having 2n electrons can be constructed resolving HFR Eq. from n basis .

使用密度矩阵近似，导出了吸收线附近NH3分子的吸收系数和调制度表达式。

Using a density matrix approach the absorption coefficient and modulation depth of NH 3 molecular near an absorption line has been formulated .

采用密度矩阵方法，推导了从激光诱导荧光（LIF）强度中抽出光碎片取向参数的表达式。

Expressions used for extracting the alignment parameter of photofragment from the laser induced fluorescence ( LIF ) intensity are derived by employing the density matrix approach .

运用Kraus算子分析红宝石激光器中离子密度矩阵元的演化

Utilizing Kraus operator to analysis the transformation of density matrix of particles of ruby laser

利用开放的V型系统密度矩阵运动方程组的零级稳态解，从定性分析和数值计算两个方面讨论了导致无反转激光的途径。

The way resulting in the lasing without inversion is discussed from the both respects the qualitative analysis and numerical calculation by using the zero order stationary solution of the density matrix motion equations of the open V type system .

以NH3分子气体为工作物质，对CO2激光和微波同时作为泵浦源的光泵亚毫米波激光系统的密度矩阵方程的求解，获得光泵激光器的频率特性和增益特性。

In this paper , the semiclassical density matrix treatment was applied to four-level system for optically pumped NH_3 molecular submillimeter wave ( SMMW ) lasers , which was pumped by CO_2 laser and microwave simultaneously .

对于实验结果的分析用两种方案执行：（a）进行密度矩阵重构，并设计了实验来证明其可行性；（b）直接分析实验谱图，从谱所表示的物理意义来分析结果。

Two schemes to analyze the results of experiments were proposed : ( a ) . performing a tomographic reconstruction of the density matrix ; ( b ) . analyzing the spectra directly to obtain the results according to the physical meaning of the spectra . 3 .

Yamamoto用修正的自旋波理论和密度矩阵重整化理论去研究海森堡亚铁磁链的热力学性质。

Yamamoto also researched the thermodynamic properties of ferrimagnetic spin chain by modified spin wave theory and density-matrix renormalization-group method .

通过对图的密度矩阵简单的组合条件（“度数条件”）判断图的密度矩阵的可分性。这个条件直接与PPT判据相联系。

We test the separability of the density matrix by researching the simple combinatorial condition ( the " degree condition "), The condition is directly related to the PPT-criterion .

运用Fourier谱学的量子理论和与之相关的密度矩阵重构技术，实际分析和提取了量子计算实验的结果，与理论预期相符。

Another quantum circuit of realizing the quantum Toffoli gate has also been proposed . · The density matrices of NMR quantum computing experiments have been successfully reconstructed by using the technique of state tomography and the quantum theories of NMR Fourier spectroscopy .

最后，我们通过密度矩阵技术得到了五维Godel黑洞和五维Myers-Perry黑洞的Hawking辐射谱。

Finally , using density matrix techniques , we obtain the Hawking radiation spectrum of the Godel and Myers-Perry black hole .

碰撞对原子产生两种效应：原子跃迁或原子能级的随机移位δω（t），本文证明δω（t）导致密度矩阵非对角元p（ab）的寿命效应。

The Collisions produces two effets on atoms : the atoms transition or the random shift δω( t ) of the levels , in thio paper , we prove that the δω( t ) leads to lifetime effects on the off-diagonal element ρ _ ( ab ) .

对弱偶合交换体系，理论线型可用改型的Bloch方程计算，但强偶合体系就需作全密度矩阵处理。

For weakly coupled systems undergoing exchange it is possible to compute theoretical ine shapes using modified Bloch equation , but strongly coupled systems require a full density matrix ( DM ) treatment .

采用密度矩阵等方法，对可饱和吸收体在激光腔内的调Q以及四波混频效应从理论上作出了统一的解释，阐述了这些效应的物理起源。

By making use of the method of density matrix , we give an unified explanation of Q-modulation and four-wave mixing effects caused by resonant saturable absorption ( RSA ) materials in a laser cavity . The underlying physical mechanism of the effects is expressed clearly .

由二子能带模型密度矩阵方法，导出了子带间光跃迁的Maxwell-Bloch（MB）方程。

The Maxwell-Bloch ( MB ) equations of two-subband model are derived , and the OB state equation for a ring cavity is obtained from the stationary solution of the MB equations .