共查询到20条相似文献,搜索用时 15 毫秒
1.
ZHAO Wen-Lei JIE Quan-Lin 《理论物理通讯》2009,51(3):465-469
We investigate the quantum-classical transition in a system of two coupled kicked rotors. We lind that when the mass of one kicked rotor is much smaller than the other's, the influence of the light kicked rotor is still able to make decoherence of the heavy one. This leads to the quantum-classical transition of the heavy kicked rotor. We demonstrate this by two different coupling potentials. 相似文献
2.
Xiang-Yao Wu Bai-Jun Zhang Hai-Bo Li Xiao-Jing Liu Jing-Wu Li Yi-Qing Guo 《International Journal of Theoretical Physics》2009,48(7):2027-2035
It is well known that Schr?dinger’s equation is only suitable for the particle in conservative force field. In atomic and
molecular field, a particle can suffer the action of non-conservative force. In this paper, a new quantum wave equation is
proposed, which can describe the particle in non-conservative force field. We think the new quantum wave equation can be used
in many fields. 相似文献
3.
OUYANGBi-Yao ZHANXian-Geng 《理论物理通讯》2001,35(3):360-364
In this paper,we study the dynamic behavior and quasi-energy spectrum of multiband superlattics Bloch electrons in quantum kicked potential.We show analytically and numerically the avoided crossing and band suppression about the quasi-energy spectrum.The dynamic nonlocalization,and the electron oscillation behavior between two bands. 相似文献
4.
Numerical investigations on non-analytic quantum kicked systems are presented. A new type of localization - power-law localization is found to be universal in the nonanalytic systems. With increasing the perturbation strength, a transition from perturbative localization to pseudo-integrable system, to dynamical localization and to complete extension is clearly demonstrated. The dependence of the localization length on perturbation is given in different parameter regimes. 相似文献
5.
M. Combescure 《Journal of statistical physics》1990,59(3-4):679-690
We study the spectral properties of the Floquet operator for the periodically kicked HamiltonianH(t) =H
0+
+
–
(t–nT),H
0 being self-adjoint and pure point. We show that the Floquet operator is pure point for almost every , if is cyclic forH
0 and has absolutely convergent expansion in the basis of eigenstates ofH
0. When this last condition is not satisfied, the Floquet operator can have a continuous spectrum, as we show by an example. 相似文献
6.
We investigate the interference of a kicked harmonic oscillator in phase space.With the measure of interference defined in Lee and Jeong[Phys.Rev.Lett.106(2011)220401],we show that interference increases more rapidly in the chaotic regime than in the regular regime,and that the sub-Planck structure is of importance for the decoherence time in the chaotic regime.We also find that interference plays an important role in energy transport between the kicking fields and the kicked harmonic oscillator. 相似文献
7.
XU You-Yang 《理论物理通讯》2013,60(4):453-457
We investigate the interference of a kicked harmonic oscillator in phase space. With the measure of interference defined in Lee and Jeong [Phys. Rev. Lett. 106 (2011) 220401], we show that interference increases more rapidly in the chaotic regime than in the regular regime, and that the sub-Planck structure is of importance for the decoherence time in the chaotic regime. We also find that interference plays an important role in energy transport between the kicking fields and the kicked harmonic oscillator. 相似文献
8.
本文提出了一种适用于量子含时波包方法的透明边界条件. 该量子含时波包方法结合分离变量表象方法使用的时候,本质上是具有谱收敛性质的. 相对于以往的复数吸收势,该透明边界条件的突出优点是其对于波函数的能谱分布并不敏感. 采用具有共振态的一维势垒散射模型,本文对该方法的特点做了阐述. 相似文献
9.
Discussed are quantized dynamical systems on orthogonal and affine groups. The special stress is laid on geodetic systems
with affinely-invariant kinetic energy operators. The resulting formulas show that such models may be useful in nuclear and
hadronic dynamics. They differ from traditional Bohr–Mottelson models where SL(n,ℝ) is used as a so-called non-invariance group. There is an interesting relationship between classical and quantized integrable
lattices.
PACS: 11.30.Ly, 02.20.-a, 21.60.Ev. 相似文献
10.
R. S. Kaushal 《International Journal of Theoretical Physics》2001,40(4):835-847
Based on the multidimensional Ermakov theory, a general result that relates the Schrodinger equation and the Milne equation in terms of a space invariant is established. Using this result not only the role of phase in the Wigner function approach to quantum mechanics is demonstrated but also a better explanation for the Aharonov–Bohm effect is sought in terms of a fundamental phase and the matter-field-coupling current. The existence of a similar space invariant is also emphasized for the nonlinear Schrodinger equation. 相似文献
11.
T. R. Mongan 《General Relativity and Gravitation》2003,35(4):685-688
In a simple quantum cosmological model involving eleven dimensional space-time, an extended holographic conjecture suggests the nuclear force must be about forty orders of magnitude stronger than gravity. An interpretation of the wave function of the universe in this model is also proposed. 相似文献
12.
13.
No Heading The idea that in dynamical wave function collapse models the wave function is superfluous is investigated. Evidence is presented
for the conjecture that, in a model of a field theory on a 1+1 lightcone lattice, knowing the field configuration on the lattice
back to some time in the past, allows the wave function or quantum state at the present moment to be calculated, to arbitrary
accuracy so long as enough of the past field configuration is known. 相似文献
14.
LIN Qiong-Gui 《理论物理通讯》2006,45(5):919-922
In quantum mechanics the center of a wave packet is precisely defined as the center of probability. The center-of-probability velocity describes the entire motion of the wave packet.
In classical physics there is no precise counterpart to the
center-of-probability velocity of quantum mechanics, in spite of the fact that there exist in the literature at least eight different velocities for
the electromagnetic wave. We propose a center-of-energy velocity to
describe the entire motion of general wave packets in classical
physical systems. It is a measurable quantity, and is well defined
for both continuous and discrete systems. For electromagnetic wave
packets it is a generalization of the velocity of energy transport.
General wave packets in several classical systems are studied and the
center-of-energy velocity is calculated and expressed in terms of the
dispersion relation and the Fourier coefficients. These systems
include string subject to an external force, monatomic chain and
diatomic chain in one dimension, and classical Heisenberg model in
one dimension. In most cases the center-of-energy velocity reduces to
the group velocity for quasi-monochromatic wave packets. Thus it also
appears to be the generalization of the group velocity. Wave packets
of the relativistic Dirac equation are discussed briefly. 相似文献
15.
A new realist interpretation of quantum mechanics is introduced. Quantum systems are shown to have two kinds of properties:
the usual ones described by values of quantum observables, which are called extrinsic, and those that can be attributed to
individual quantum systems without violating standard quantum mechanics, which are called intrinsic. The intrinsic properties
are classified into structural and conditional. A systematic and self-consistent account is given. Much more statements become
meaningful than any version of Copenhagen interpretation would allow. A new approach to classical properties and measurement
problem is suggested. A quantum definition of classical states is proposed. 相似文献
16.
17.
作为含时薛定谔方程的微扰近似解,在速度规范下给出了激光场中缀饰原子的一个波函数.利用平均激发能近似和完备关系,可将此波函数简化为一个含时的相乘算符作用于无场时的"裸原子"态上.在软光子近似下,平均激发能仅出现在光场频率的一阶和二阶项上.此波函数适用于计算激光辅助的散射过程,特别是重排过程. A wave function for laser dressed atom is derived as a perturbative solution of the time dependent Schrdinger equation in the velocity gauge. With the use of the average excitation energy approximation and the closure approximation, the solution is reduced to a time dependent operator acting on the "bare" atomic state. In soft photon approximation, the average excitation energy only appears in the first and second order terms of field frequency. Such a simplified dressed wave function is useful in... 相似文献
18.
During the long course of evolution, nature has learnt how to exploit quantum effects. In fact, recent experiments reveal the existence of quantum processes whose coherence extends over unexpectedly long time and space ranges. In particular, photosynthetic processes in light-harvesting complexes display a typical oscillatory dynamics ascribed to quantum coherence. Here, we consider the simple model where a dimer made of two chromophores is strongly coupled with a quasi-resonant vibrational mode. We observe the occurrence of wide oscillations of genuine quantum correlations, between electronic excitations and the environment, represented by vibrational bosonic modes. Such a quantum dynamics has been unveiled through the calculation of the negativity of entanglement and the discord, indicators widely used in quantum information for quantifying the resources needed to realize quantum technologies. We also discuss the possibility of approximating additional weakly-coupled off-resonant vibrational modes, simulating the disturbances induced by the rest of the environment, by a single vibrational mode. Within this approximation, one can show that the off-resonant bath behaves like a classical source of noise. 相似文献
19.
本文研究了双光子过程原子与耦合腔相互作用系统中腔场的压缩效应和反聚束效应.考虑系统总激发数等于2的情况,利用数值计算方法讨论了腔场间的耦合强度变化和原子与腔场间耦合强度变化对反聚束效应的影响.研究结果表明:腔场不呈现出压缩效应;腔场的反聚束效应与原子与腔场的耦合系数之间,以及与腔场间的耦合系数之间都存在着非线性关系. 相似文献
20.
We show the existence of an anticentrifugal force for a quantum particle in a bent waveguide. This effect may be observed in interference experiments which are sensitive to the additional phase of the wavefunction gained in the bent regions and can find application in distinguishing between straight and bent geometries. 相似文献