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相干态光场的位相统计性质 总被引:5,自引:0,他引:5
根据Pegg-Barnett位相定义,计算了相干态光场的位相概率分布函数,并且进行了数值模拟。研究表明在真空态时,位相分布曲线为一条直线;相干态下位相分布曲线表现为:均匀分布→泊松分布→均匀分布。 相似文献
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算符a^K本征态热迭加光场的光子数统计分布 总被引:1,自引:0,他引:1
利用密度矩阵方法,导出了光子湮没算符高次幂a^K(k≥2)本征态热迭加光场光子数统计分布的一般表达式,讨论了热噪声对非经典光场态光数统计分布振荡行为的影响。 相似文献
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本文采用求解Schroedinger方程和数值计算方法,研究了Ⅴ-型三能级原子与双模奇偶纠缠相干光场相互作用系统的光子统计性质,结果表明:此性质与双模奇偶纠缠相干光场的纠缠程度、失谐量、原子的初态以及双模光的平均光子数相关联. 相似文献
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考虑双模纠缠相干光场,在其中一束光场中注入一个二能级原子(处于基态和激发态线性叠加态),参与腔QED演化之后,对原子作选择性的测量,通过操纵参数的变化范围,可实现对光场非经典性质的控制。我们经过研究发现:如果对相互作用的时间t以及参与相互作用的相干光场的参数|β|实行一定的操纵,对于未参与相互作用的光场|α|,我们可以控制改变它的反聚束效应(光子数的亚泊松分布)、压缩效应等一系列的非经典性质,如果选取合适的参数和一定的演化时间,我们可以使原来的相干态光场变为反聚束光场、压缩光场等一系列非经典光场。也就是说,我们通过利用相干光场之间的纠缠关联实现了远程操纵光场的非经典性质这一目的。这一研究结果对于连续变量的量子控制和量子通信具有一定的实际应用价值。 相似文献
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双模纠缠相干光场与V型三能级原子相互作用系统的光子统计性质 总被引:4,自引:7,他引:4
本文采用求解Schrodinger方程和数值计算方法,研究了双模纠缠相干光场与三能级原子相互作用系统的光子统计性质,结果表明:此性质与双模纠缠相干光场的纠缠程度、失谐量、双模光的平均光子数和原子的初态相关联. 相似文献
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运用弱散射体产生的部分显现散斑场相位差自由标准偏差的近似表达式,计算和分析了由单会聚透镜成象产生的象平面部分显现高斯散斑场相位差的自由统计性质. 相似文献
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The general evolution of the interaction of two radiation fields with an effective two-level atom via the Raman-type transitions is presented. Using the Pegg-Barnett phase theory, the joint phase probability distribution of the two field modes, phase average values and phase fluctuations are studied in detail. Also, the effect of the presence of a field on the phase properties of the other mode is examined. 相似文献
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对于线性单频混响声场的统计特性的研究人们曾做了许多工作,建立了均方根声压和平均声能密度统计分布理论。本文在此基础上推导出声压级统计分布函数,并把处理方法推广到混响室内在强大声源激发下的非线性单频混响声场,求得各谐波声场和总声场的统计分布函数。
本文实验采用数字测量技术,对混响声场进行了大量的测量,得到的实验结果与理论符合良好。 相似文献
本文实验采用数字测量技术,对混响声场进行了大量的测量,得到的实验结果与理论符合良好。 相似文献
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INFLUENCE OF THE DIPOLE-DIPOLE INTERACTION BETWEEN ATOMS ON THE PHASE PROPERTIES OF LIGHT 总被引:2,自引:0,他引:2 下载免费PDF全文
The time evolution and the statistic characteristic of the light phase in the Tavis-Cummings (T-C) model of two identical two-level atoms coupled to a strong coherent light field are studied by means of the Pegg-Barnett phase theory. It is proved that the dipole-dipole interaction between atoms will lead to the frequency shift of light, the weakening of the degree of atom-field coupling and the restraint of light phase diffusion. 相似文献
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Theoretical models that can be used to predict the range of mainlobe widths and the probability distribution of the peak sidelobe levels of two-dimensionally sparse arrays are presented here. The arrays are considered to comprise microphones that are randomly positioned on a segmented grid of a given size. First, approximate expressions for the mean and variance of the squared magnitude of the aperture smoothing function are formulated for the random arrays considered in the present study. By using the variance function, the mean value and the lower end of the range i.e., the first 1 per cent of the mainlobe width distribution, can be predicted with reasonable accuracy. To predict the probability distribution of the peak sidelobe levels, distributions of levels were modelled by using a Weibull distribution at each peak in the sidelobe region of the mean squared magnitude of the aperture smoothing function. The two parameters of the Weibull distribution were estimated from the means and variances of the levels at the corresponding locations. Next, the probability distribution of the peak sidelobe levels were identified by following a procedure in which the peak sideload level was determined as the maximum among a finite number of independent random sidelobe levels. It was found that the model obtained from that approach predicts the probability density function of the peak sidelobe level distribution reasonably well for the various combinations of the two different numbers of microphones and the various grid sizes tested in the present study. The application of these models to the design of random, sparse arrays having specified performance levels is discussed. 相似文献
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