共查询到20条相似文献,搜索用时 78 毫秒
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在有关量子跃迁的问题中,含时微扰理论给出了跃迁概率振幅的一级近似解.本文通过计算指出,若微扰只与时间有关,则体系的波函数可以精确求解,从而得到跃迁概率振幅的精确表达式。 相似文献
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从Schr(o)dinger方程出发,结合自旋的唯象描述、简单的相对论考虑和适当的猜测,写出了Dirac方程的正确形式. 相似文献
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讨论势函数为V(ρ)=2ρ λρα的非谐振子的Schr dinger方程。当α=2时其有Hamiltonian量的精确束缚态解。当α3时其有Hamiltonian量的微扰解,尤其是它的一阶、两阶的能量修正及零级、一级波函数。 相似文献
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提出由第三类生成函数法构造高阶Schroedinger方程δu/δt=i(-1)^nδ^2mu/δx^2m的高精度辛格式.首先,给出它的典则Hamilton方程组;然后,成功地克服了本质上是困难的高阶变分导数的计算,并利用第三类生成函数法得到在时间方向具有任意阶精度的半离散方程,进而得到原始方程相关的修正方程的离散形式,最后得到各种精度的辛格式.数值结果表明该格式是有效的,具有高精度及良好的长时间数值行为等特性. 相似文献
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将一维定态Schr(o)dinger方程转化为等价的哈密顿正则方程,并采用辛格式计算了7Li2分子的振动能级. 相似文献
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量子通信是一个量子密钥分发过程,目前采用的通信技术严重制约了量子密钥分发的比特率.将多输入多输出(MIMO)技术应用于量子通信系统,提高量子密钥分发的比特率,促进量子通信向高速大容量发展.然而,量子场本身不可避免地存在量子噪声约束容量的增长,限制了可利用空间资源,即空间自由度.文中采用光子场的量子化和满足Schrdinger方程条件的电磁场波动方程推导出MIMO量子信道的空间自由度上限,为开发稳健的MIMO量子通信空时处理算法和优化设计高性能MIMO量子通信系统提供理论基础和技术支持.
关键词:
多输入多输出
量子密钥分发
Schrdinger方程
光子场的量子化 相似文献
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In this paper we show that any measure arising as a weak* limit of microlocal lifts of eigenfunctions of the Laplacian on certain arithmetic manifolds have dimension at least 11/9,
and in particular all ergodic components of this measure with respect to the geodesic flow have positive entropy.
Received: 14 March 2002 / Accepted: 24 June 2002 Published online: 13 January 2003 相似文献
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I. Ogawa T. Idehara S. Maekawa W. Kasparek G. F. Brand 《International Journal of Infrared and Millimeter Waves》1999,20(5):801-821
A compact system to convert gyrotron output into an intense gaussian beam has been designed by introducing an intermediate focusing element into the quasi-optical system. The design is significantly simplified by applying gaussian optics and confirmed by application of the Huygens equation. The beam quality is improved by truncating the sidelobes of the far-field. In spite of the beam truncation, only a small fraction (11 %) of the beam power is sacrificed. 相似文献
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Laser Doppler anemometry (LDA) is one of the most advanced optical measuring techniques for flow velocities and is widely used in industrial and academic laboratories. Based on numerous applications in the past, there is no doubt that LDA is one of the most accurate flow measuring techniques. However, recent investigations have shown that the period lengths of LDA signal bursts are not as constant as one might expect within the individual burst. This can induce an additional scatter in the signal frequency and in the determination of flow velocity from individual bursts. This paper describes experimental investigations which show qualitatively and quantitatively that the particle passage through the laser beams shortly before the point of intersection, i. e. the LDA measuring volume, yields a distorted LDA fringe pattern. The latter results in a scatter of the measured velocity data for those particles passing the center of the measuring volume at the same time. 相似文献
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大功率激光二极管双峰结构远场分布模型 总被引:4,自引:0,他引:4
为了合理地设计光学系统以整形激光二极管出射光束,必须准确了解激光二极管的远场分布,然而对于大功率激光二极管仍没有形式简单并且较好反映实际器件特性的光束模型。基于亥姆霍兹方程的严格远场解,提出使用两个离心高斯光束描述场源处平行结平面方向的模式场分布,将其代入严格远场解中得到一种描述大功率激光二极管远场光分布模型.用于描述其双峰远场结构。理论模型与三种实际器件的测量数据进行了比较,曲线主要部分都能很好吻合,并且偏差部分的能量仅占总能量的1%~2%。该模型数学表达形式简单,可以方便地用于研究光束经光学系统后的变换,以及计算光学系统的耦合效率,而且对于定量设计光学整形系统十分有用。 相似文献
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Richard Healey 《Foundations of Physics》2018,48(11):1568-1589
Three recent arguments seek to show that the universal applicability of unitary quantum theory is inconsistent with the assumption that a well-conducted measurement always has a definite physical outcome. In this paper I restate and analyze these arguments. The import of the first two is diminished by their dependence on assumptions about the outcomes of counterfactual measurements. But the third argument establishes its intended conclusion. Even if every well-conducted quantum measurement we ever make will have a definite physical outcome, this argument should make us reconsider the objectivity of that outcome. 相似文献
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The quantum theory of nonlinear dynamics and the switching effect for two distributively coupled modes in optical systems has been developed based on the Hartree approximation. The quantum limits for observation of the switching effect for the polarization characteristics of light has been determined. The creation of a new type of nonclassical mesoscopic states of light like the Schrödinger-cat states and mesoscopic qubit/qutrit states is predicted. The theoretical prediction is confirmed by a numerical estimation of real systems, i.e., tunnel-coupled optical fibers and waveguides, for the experimental realization of the states under consideration. 相似文献