共查询到18条相似文献,搜索用时 46 毫秒
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q变形对相干态的相位概率分布特性 总被引:2,自引:0,他引:2
通过推广Pegg和Barnett的相位算符和相位态到q变形的双模情况, 应用数值计算
研究了q变形对相干态的相位概率分布特性. 结果表明, q变形对相干态的相位概率分布受到相位参数、q参数和参数│ξ│的调节, 从而反映出不同的量子相干特性. 相似文献
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根据Pegg-Barnett 相位定义,计算了一种新的非线性叠加相干态的相位概率分布函数和光子数-相位压缩效应,并进行了数值模拟. 相似文献
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应用Pegg和Barnett提出的相位算符和相位态理论,研究了激发压缩真空态的相位概率分布特性.数值计算结果表明,激发压缩真空态的相位概率分布主要受到相位参量和压缩参量的调节,相位参量使相位概率分布呈峰值结构,压缩参量的变化将影响相位概率分布的峰值强度,此外激发光子数对相位概率分布也有较大的影响. 相似文献
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叠加激发相干态的量子特性 总被引:4,自引:0,他引:4
构造了2个强度相同位相不同的激发相干态的叠加态,并通过数值计算研究了该叠加态的反聚束效应和振幅平方压缩效应随激发光子数m、光场强度x和相位差θ的变化,结果表明:随激发光子数m和光场强度x增大,该量子态的振幅平方压缩均会加深;压缩效应与相位差θ有密切的关系;随光场强度x的增大和激发光子数m的增大,其反聚束效应减弱. 相似文献
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研究了非简谐振子广义相干态的叠加态的非经典性质,得到了出现周期性压缩现象的充要条件并给出了反聚束效应与叠加系数之间的关系.
关键词: 相似文献
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构造出了奇偶对相干态的指数形式, 并把奇偶对相干态推广至有限维Hilbert空间, 获得了有限维奇偶对相干态, 然后讨论了它们的正交归一完备性、反聚束效应和相位概率分布. 结果表明, 在此空间中奇偶对相干态具有归一完备性, 但不具有正交性. 借助于数值计算发现, 无论q取何值, 在参数|ξ|的不同取值范围内, 对于5维Hilbert空间中奇偶对相干态在模1和模2两个方向上均可呈现反聚束效应, 并且此双模光场的光子均是相关的. 而在7维Hilbert空间中,奇偶对相干态相位概率分
关键词:
有限维奇偶对相干态
反聚束效应
相位概率分布 相似文献
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从相位分布和Wigner函数两个方面研究了任意两个相干态|β〉 and |mβeiδ〉的叠加态的量子统计性质.结果表明这种叠加态的非经典特性与β2,振幅系数m,相干态间的位相差δ以及叠加系数间的位相差都有关.当参量选择合适,这种叠加态存在着量子效应.计算了两个相干态等几率混合系综的相位分布和Wigner函数,经过与前者比较,结果表明由于相干项的存在,使得叠加态具有很好的量子力学行为. 相似文献
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E. M. Khalil 《International Journal of Theoretical Physics》2007,46(11):2816-2828
In this communication we study a superposition of two finite dimensional pair coherent states. We show that such states possess
inherent nonclassical properties such as sub-Poissonian distribution, anti-correlation between the two-mode and violation
of Cauchy–Schwarz inequalities. The s-parameterized characteristic function (CF) is considered. Furthermore, the phase distribution
in the framework of Pegg and Barnett formalism, W-function and Q-function are discussed. General conclusions reached are illustrated
by numerical results. 相似文献
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High-order harmonic generations from a one-dimensional Coulomb potential atom are calculated with the initial state prepared as a coherent superposition between its ground and first excited states. When the energy difference of the two states is small, we can choose proper laser pulse such that the first excited state can be excited only to other bound states instead of being ionized. We show that only the hyper-Raman lines are observable instead of the harmonics. The energy difference of the ground and the first excited state can be deduced from the highest peak of the hyper-Raman lines. We further show that the similar results can be obtained by using a combination of two laser pulses with different frequencies interacting with the atom initially at the ground state. 相似文献
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ZHENF Yi-xhuang GU Yong-jian GUO Guang-can 《量子光学学报》2002,8(Z1):19-20
We investigate the problemm of teleportation of a superposition coherent state with nonmaximally entangled coherent channel. Two strategies are considered to complete the task. The first one uses entanglement concentration to purify the channel to a maximally entangled one. The second one teleports the state through the nonmaximally entangled coherent channel directly. We find that the probabilities of successful teleportations for the two strategies are depend on the amplitudes of the coherent states and the mean fidelity of teleportation using the first strategy is always less than that of the second strategy. 相似文献
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M. Sebawe Abdalla A. S.-F. Obada M. Darwish 《International Journal of Theoretical Physics》2011,50(1):181-199
We study the effect of the squeeze operator on the finite pair-coherent state. The state is a type of a correlated two-mode
state in finite dimension based on the resonant ion-cavity interaction. We have discussed some statistical properties for
such state, especially the quadrature variances as well as the second-order correlation function. Furthermore we have also
considered the variance in the photon number sum and difference in addition to the linear correlation function. It is shown
that the strong correlation occurs for a large value of the photon number difference. Our discussion is extended to include
the quasiprobability distribution functions (W-Wigner and Q-functions). In the meantime we have considered the quadrature distribution function and phase distribution. It has been shown
that the squeezed finite pair coherent state is sensitive to the variation in the state parameter, ξ and the squeeze parameter, r, as well as the q parameter which in fact plays a crucial role of controlling the behavior of the system. 相似文献
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Hong-Chun Yuan Xue-Xiang Xu Hong-Yi Fan 《International Journal of Theoretical Physics》2009,48(12):3596-3606
We present a class of generalized photon-added pair coherent states (GPAPCS) and analyze some prominent nonclassical properties
such as sub-Poissonian distribution and violations of Cauchy-Schwarz inequalities. In addition, we derive that the Wigner
function of GPAPCS involves correlation of two two-variable Hermite polynomials and its Husimi function is related to a two-variable
Hermite polynomial. Their behaviors varying with the phase space parameters are also graphically discussed. We find that the
nonclassical effects of GPAPCS exhibits more with increasing of excitation photon numbers. 相似文献
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We investigate the entanglement swapping of continuous state and the two-mode squeezed vacuum which is exposed variable using the pair coherent state as the input in a phase decoherence environment as the quantum channel. By adopting the log-negativity as the measure of entanglement, we analyze how entanglement of the two initial states and the phase decoherence environment affect the entanglement swapping quality. 相似文献