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- In this paper, expound a semiclassical density matrix theory, it was used by Author in theoretical study of miniature optically pumped submillimeter wave laser. 重点论述在小型光泵亚毫米波激光的理论研究中所应用的量子系统的半经典密度矩阵理论。
- density matrix theory 密度矩阵理论
- Off-diagonal elements of density matrix go to zero. 经典定义:密度矩阵非对角元趋于零。
- The atom's reduced density matrix is calculated when the quantum theory in small system coupled to thermal reservoir is used.The decoherence properties of atom is analyzed. 利用小系统与库耦合行为的量子理论，计算原子约化密度矩阵非对角元，分析原子状态的消相干特性。
- Recent perspectives in random matrix theory and number theory. 随即距阵理论和数论新观点。
- Fuzheng Zhang, “Matrix Theory”, Springer-Verlag, N.Y., 1999. 程云鹏，“矩阵论”，西北工业大学出版社，1999。
- By solving the density matrix equations, we gained the susceptibility. 通过求解密度矩阵方程,得到感生极化率。
- A method is proposed to construct a localized active functional space from the density matrix of a large system. 报道了从大体系的密度矩阵出发构造定域于指定局部的活性泛函空间的方法和程序。
- We start from the schrodinger equation, researching on the interaction process of cold atoms system with Raman laser pulse, and then educe the density matrix equation. 第二章推导出了原子与拉曼脉冲激光作用后的能态分布矩阵以及原子在重力场中的传输矩阵。
- When the density matrix of the whole ensemble consisted of system-meter is reduced to the microscopic physical system, the system trend quantum decoherence in nature. 把由系统与仪器组成的系综的密度矩阵约化到被测系统部分，于是自然趋近量子退相干。
- Density Matrices I. Initial Non-Eigenstate Preparation, Evolution, Detection. 19密度矩阵I.;初始非本征态的准备、演化、探试。
- Positive definite matrix occupies a very important position in matrix theory, and has great value in practice. 摘要正定矩阵在矩阵论中占有十分重要的地位，在实际中也有广泛的应用价值。
- Generalized strictly diagonally dominant matrix play an important role in matrix theory and real applications. 广义严格对角占优矩阵在矩阵理论和实际应用中具有重要的作用和意义。
- In this paper, the judgement of existing solution to circulant linear equations set and the solutions under all kinds of circumstances are presented by polynomial matrix theory. 摘要利用多项式矩阵理论，给出了循环线性方程组有解的判定并求出各种情况下的解。
- Using the method of density matrix, we get the rate equations about electron transport in the mesoscopic system derived form many body schrodinger equation. Makeing using of them, we obtain the spin current and charge current through the systems. 本文利用密度矩阵的方法，由多粒子体系的薛定谔方程，我们得到了微观体系中电子输运的几率方程，从而推导出通过量子点的自旋电流与电荷流的表达式。
- Coherent states of two dimensional asymmetrical harmonic oscillator,which prop- agate in additional octupole deformation potentials, are used to investigate the complexity of the density matrix and the sensitivity against the strength of disturbance. 运用在二维不对称谐振子势加八极形变势中传播的二维不对称谐振子相 干态，研究了不同强度耦合作用下密度矩阵的复杂性及对干扰动强度微小变动 的敏感性。
- From the numerical simulation and the steady-state solution to the density matrix equations, we find that AWI can be realized by choosing theintensities of the pumping and the magnetic fields and the relative phase of the probing and the pumping fields. 从密度矩阵方程出发,对三个态的粒子数进行了数值模拟,并得到了密度矩阵方程的稳态解,由稳态解得到了实现无反转放大的条件。 适当选取泵浦光场的Rabi频率和相干磁场的Lamor频率以及探测光场和泵浦光场之间的相对相位,可以在此系统中实现无反转放大。
- In this paper, quantum coherences under weak interaction in A, AX, AMX and AFMX systems of which spin quantum number 1/2is,and in A and AX systems of which spin guantum number is 3/2 are calculated by using the density matrix. 本文用密度矩阵计算了在弱相互作用下,自旋都为1/2的核的A、AX、AMX与AFMX四种体系以及自旋都为3/2的核的A与AX两种体系中的各种量子相干。
- Using matrix theory, we present a sharp upper bound on the spectral radius of digraphs and strongly connected diagraphs. 摘要利用矩阵理论，给出了简单有向图的谱半径可达上界和强连通有向图的谱半径上界。
- The modeling problem of the two-level system exposed to open environment is mainly investigated based on the Lindblad quantum master equation described in terms of the density matrix. 摘要二能级开放量子系统的调控问题对实现量子计算机的量子门等基础问题有着重要的理论意义和应用价值。
