排序方式: 共有41条查询结果,搜索用时 0 毫秒
1.
The quantum fluctuation of photon counting limits the field application of optical time domain reflection. A method of photon counts modulation optics time domain reflection with single photon detection at 1.55 μm is presented. The influence of quantum fluctuation can be effectively controlled by demodulation technology since quantum fluctuation shows a uniform distribution in the frequency domain. Combined with the changing of the integration time of the lock-in amplifier, the signal to noise ratio is significantly enhanced. Accordingly the signal to noise improvement ratio reaches 31.7 dB compared with the direct photon counting measurement. 相似文献
2.
为探索量子系统的退相干机制寻找延缓退相干的方法,本文研究了关联量子信道中的退相干过程,计算了关联退极化信道中两体qutrit系统的3种初态:一种特殊初态、最大相干初态和各向同性初态的范数相干性、相对熵相干性及基矢无关相干性.分析得出的解析结果、数值结果和演化图像可以发现:1)完全关联的信道能最大程度地抑制退相干;2)存在一个与关联度无关的最大退相干时间点,但其退相干的演化行为却依赖着关联度;3)信道的关联可以增强子系统间的相干性.基矢无关相干性遵循的不等式关系也在此系统中得以验证. 相似文献
3.
4.
A new family of the supramolecular antiferromagnetically exchange-coupled dimer of single-molecules magnets, [Mn4]2, really behave as a quantum mechanical coupled system and can be used for quantum computation [Tiron et al (2003) Phys. Rev. Lett. 91 227203]. We study the time evolution of [Mn4]2 dimer interacting 相似文献
5.
6.
量子态的关联特性是量子通信和量子计算的重要资源。文章首先回顾了经典关联、量子关联的概念以及常用的度量方法,随后简要介绍了作者最近对固态格点自旋体系中量子关联的研究成果。最后对未来量子关联的研究指出了几个方向。 相似文献
7.
(2s+1)维希尔伯特空间q—畸变谐振子奇相干态的光学性质 总被引:1,自引:0,他引:1
构造了(2s 1)维希尔伯特(Hilbert)q-畸变谐振子奇相干态,讨论了其量子统计特性。发现(2s 1)维希尔伯特空间q-畸变谐振子相干态与通常无限维空间的奇q-相干态和奇相干态有明显不同的压缩及反聚束效应。 相似文献
8.
在大学普通物理的教学中,对波动能量的理解是一个重点和难点.对简谐波势能的完整讨论需要涉及材料力学方面的背景知识,少学时的普通物理课程中一般未涵盖这些内容;因此很多教材只是用示意图来定性说明简谐波的势能和动能密度相等,或者不加证明直接给出结论,这在一定程度上影响了教学效果.本文基于细绳中传播的简谐波给出了简谐波弹性势能的一种简明推导,只需使用受力分析等学生较熟悉的力学知识,且在介质的弹性限度内对于大幅振动也适用,便于学生理解和掌握. 相似文献
9.
Measurement-induced disturbance between two atoms in Tavis-Cummings model with dipole dipole interaction 下载免费PDF全文
Quantum correlation, measured by measurement-induced disturbance (MID), between two two-level atoms is investi- gated in detail in Tavis-Cummings model with dipole--dipole interaction (DDI). We find that MID can be determined only by the dipole-dipole interaction between the two atoms when the cavity and atoms are at resonance. Moreover, DDI will have different effects on MID for two different kinds of initial states. 相似文献
10.