共查询到20条相似文献,搜索用时 62 毫秒
1.
We propose an approach to connect components of a quantum computer by using a linear cluster state, with which an arbitrary N-particle state can be perfectly propagated between quantum components in two ways that are based on feedback measurements and local transformation. 相似文献
2.
YANFeng-Li WANGMei-Yu 《中国物理快报》2004,21(7):1195-1197
We investigate the dense coding in the case of non-symmetric Hilbert spaces of the sender and receiver‘s particles sharing the quantum maximally entangled state. The efficiency of gaining classical information is also considered.We conclude that when a more level particle is with the sender, she can obtain a non-symmetric quantum channel from a symmetric one by entanglement transfer. Thus the efficiency of information transmission is improved. 相似文献
3.
New Types of the Lie Symmetries and Conserved Quantities for a Relativistic Hamiltonian System 总被引:2,自引:0,他引:2 下载免费PDF全文
LUOShao-Kai 《中国物理快报》2003,20(5):597-599
For a relativistic Hamiltonian system,two new types of the Lie symmetries and conservation laws are given under infinitesimal transformaitons of groups.On the basis of the theory of invariance of the relativistic Hamiltonian equations under infinitesimal transformations and introducing infinitesimal transformations for time t,generalized coordinates qs and generalized monenta ps,we obtain the determinging equations,the structure equations and the conserved quantities of the Lie symmetries.Introducing infinitesimal transformation for generalized coordinates qs and generalized momenta ps,we construct the Lie symmetrical transformations of the system,which only depend on the canonical variables.A set of conserved quantities are directly obtained from the Lie symmetries of the syste.An example is given to illustrante the application of the results. 相似文献
4.
ZHAO Shu-Hong LIANG Li-Fu QIAO Yong-Fen 《理论物理通讯》2007,48(5):791-794
We present a general approach to the construction of conservation laws for the nonholonomic singular Lagrange system. Firstly, the differential equations of motion of the system are written, the definition of integrating factors is given for the system. Next, the necessary conditions for the existence of the conserved quantity are studied in detail. Finally, the conservation theorem and its inverse are established for the system, an example is given to illustrate the application of the result. 相似文献
5.
Fang-Pei Chen 《International Journal of Theoretical Physics》2009,48(3):847-856
The various methods to derive Einstein conservation laws and the relevant definitions of energy-momentum tensor density for
gravitational fields are studied in greater detail. It is shown that these methods are all equivalent. The study on the identical
and different characteristics between Lorentz and Levi-Civita conservation laws and Einstein conservation laws is thoroughly
explored. Whether gravitational waves carry the energy-momentum is discussed and some new interpretations for the energy exchanges
in the gravitational systems are given. 相似文献
6.
It is shown that the configuration of phase coding for quantum key distribution with single photon can also be used for continuous variable quantum key distribution. Therefore the robust long-distance high-speed quantum key distribution can be achieved with current technology. 相似文献
7.
The one-dimensional time-independent Schr6dinger equation is transformed into a Hamiltonian canonical equation by means of the Legendre transformation, then the symplectic schemes and a new shooting method extended to the eigenvalues of the Schr6dinger equation. The method is applied to the calculations of one-dimensional harmonic oscillator, an anharmonic oscillator and the hydrogen atom. The numerical results are in good agreement with the exact ones. 相似文献
8.
NovelSchemeforNarrowBandFiberFilterSystemZHAOYucheng;JIANShuisheng;WANGWei;TIANWenqiang(NorthernJiaotongUnviversity,Institute... 相似文献
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We propose a practical scheme for one-way quantum computing based on efficient generation of 2D cluster state in thermal cavities.
We achieve a controlled-phase gate that is neither sensitive to cavity decay nor to thermal field by adding a strong classical
field to the two-level atoms. We show that a 2D cluster state can be generated directly by making every two atoms collide
in an array of cavities, with numerically calculated parameters and appropriate operation sequence that can be easily achieved
in practical Cavity QED experiments. Based on a generated cluster state in Box(4) configuration, we then implement Grover’s search algorithm for four database elements in a very simple way as an example
of one-way quantum computing. 相似文献
11.
In this paper, a classical system of ordinary differential equations is built to describe a kind of n-dimensional quantum systems. The absorption spectrum and the density of the states for the system are defined from the points of quantum view and classical view. From the Birkhoffian form of the equations, a Birkhoffian symplectic scheme is derived for solving n-dimensional equations by using the generating function method. Besides the Birkhoffian structure- preserving, the new scheme is proven to preserve the discrete local energy conservation law of the system with zero vector f . Some numerical experiments for a 3-dimensional example show that the new scheme can simulate the general Birkhoffian system better than the implicit midpoint scheme, which is well known to be symplectic scheme for Hamiltonian system. 相似文献
12.
利用辛积分和高阶交错差分方法建立了求解含时薛定谔方程的高阶辛算法(SFDTD(4,4)).对空间部分的二阶导数采用四阶准确度的差分格式离散得到随时间演化的多维系统再引入四阶辛积分格式离散;探讨了SFDTD(4,4)法的稳定性,获得了含时薛定谔方程的一维以及多维的稳定性条件,并得到在含势能情况下该稳定性条件的具体表达式;借助复坐标沿伸概念,实现了SFDTD(4,4)法在量子器件模拟中的完全匹配层吸收边界条件.结合一维量子阱和金属场效应管传输的仿真,结果表明较传统的时域有限差分算法,SFDTD(4,4)有着更好的计算准确度,适用于长时间仿真.算法及相关结果可为实际量子器件的设计提供必要的参考. 相似文献
13.
在矩形域[-a,a]×[-a,a]内对微分算子L=(ə2)/(əx2)+(ə2)/(əy2)用5点差分格式将二维非定常Sine Gordon方程离散化为一个2×7992阶非线性Hamilton系统.对该系统使用Euler中心格式,得到一个非线性方程组.对此方程组建立迭代解法并给出了这个迭代方法的收敛条件和收敛速度.Sine Gordon方程单孤子和双孤子的数值模拟试验显示该辛算法是有效的. 相似文献
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16.
In this paper, we study a high-order compact difference scheme
for the fourth-order fractional subdiffusion system. We consider the situation in which
the unknown function and its first-order derivative are given at the boundary. The scheme
is shown to have high order convergence. Numerical examples are given to verify the theoretical results. 相似文献
17.
单个守恒型方程熵耗散格式中熵耗散函数的构造 总被引:4,自引:0,他引:4
对于一维单个守恒律方程,文[8]设计了一种非线性守恒型差分格式.此格式为二阶Godunov型的,用的是分片线性重构(reconstruction),重构函数的斜率是根据熵耗散得到的.格式满足熵条件.与传统的守恒格式不同的是此格式在计算过程中不仅用到了数值解还用到了数值熵.在此格式中一个所谓的熵耗散函数起到了很重要的作用,它在每一个网格的计算中耗散熵,以保证格式满足熵条件.文[8]中设计的熵耗散函数比较复杂,并且不是很完善.故数值地分析了在格式的构造中为何应给熵以一定的耗散,及应耗散多少.并且给出了一个新的以数值解的二阶差分作为基本模块的熵耗散函数.最后给出了相应的数值算例. 相似文献
18.
Integrating Factors and Conservation Theorems of Lagrangian Equations for Nonconservative Mechanical System in Generalized Classical Mechanics 总被引:1,自引:0,他引:1
QIAO Yong-Fen ZHAO Shu-Hong 《理论物理通讯》2006,46(1):43-45
The conservation theorems of the generalized Lagrangian equations for nonconservative mechanical system are studied by using method of integrating factors. Firstly, the differential equations of motion of system are given, and the definition of integrating factors is given. Next, the necessary conditions for the existence of the conserved quantity are studied in detail. Finally, the conservation theorem and its inverse for the system are established, and an example is given to illustrate the application of the result. 相似文献
19.
QIAO Yong-Fen ZHAO Shu-Hong 《理论物理通讯》2006,46(7)
The conservation theorems of the generalized Lagrangian equations for nonconservative mechanical system are studied by using method of integrating factors. Firstly, the differential equations of motion of system are given, and the definition of integrating factors is given. Next, the necessary conditions for the existence of the conserved quantity are studied in detail. Finally, the conservation theorem and its inverse for the system are established, and an example is given to illustrate the application of the result. 相似文献