共查询到20条相似文献,搜索用时 727 毫秒
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从两量子位核磁共振量子计算机物理模型出发,通过解单体含时薛定谔方程和解两体含时薛定谔方程,提出了Grover量子算法核磁共振脉冲序列参量设定的两种规则,给出了具体参量取值,并进行了数值仿真,仿真结果表明:解两体薛定谔方程给出的参量设定规则,能使两量子位量子搜索的目标态是纯基态,目标态的z分量期望值精确度达到在小数点后三位与理论值完全相同,验证了我们提出的参量设定规则的正确性. 相似文献
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从两量子位核磁共振量子计算机物理模型出发,在旋转参考系中通过近似解两体含时薛定谔方程,给出了两量子位量子搜索算法核磁共振脉冲序列参量设定的规则,给出了参量取值.根据Suzuki对称乘积公式,将一个时间演化算符分解成若干对称指数算符有序乘积,用该方法对含时薛定谔进行数值计算,数值计算结果验证参量设定的规则及参量具体取值是正确的. 相似文献
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从两量子位核磁共振量子处理器物理模型出发,利用Raedt小组提出的自旋-1/2代数理论,根据量子控制非门的定义及Grover量子算法原理,介绍了量子控制非门的4种不同脉冲序列及两量子位Grover量子算法的两种不同脉冲序列的设计过程,通过数值求解含时薛定谔方程模拟量子控制非门和两量子位Grover量子算法,等价于执行量... 相似文献
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弥散补偿飞秒激光量子理论研究 总被引:1,自引:1,他引:0
本文根据我们新建的激光器模型,导出了非线性成形飞秒光脉冲的量子理论锁模方程。在薛定谔表象中,用含时哈特利近似方法求得了脉冲电场及光子数分布的形式解。最后讨论了量子锁模方程过渡到经典情形下稳态时的脉冲能量、脉宽及啁啾参量与飞秒激光器运转参量间的关系,得到了理论与实验一致的结果。 相似文献
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M. Nakano S. Ohta R. Kishi H. Takahashi S. Furukawa 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,38(3):523-532
We investigate the relaxation effects on the dynamics of two-component
dilute gas Bose-Einstein condensates (BEC) with relatively different
two-body interactions and Josephson couplings between the two components.
Three types of relaxation effects, i.e., one- and three-body losses and a
pure phase relaxation caused by elastic two-body collision between condensed
and noncondensed atoms, are examined on the dynamical behavior of a
macroscopic superposition, i.e., Schr?dinger cat state, of two states
with atom-number differences between the two components, which is known to
be created by the time evolution in certain parameter regimes. Although
three-body losses show a relatively large suppression of the revival
behavior of Schr?dinger cat state and the Pegg-Barnett phase-difference
distribution between the two components for a small-size Schr?dinger cat
state, one- and three-body loss effects are not shown to directly depend on
the size of Schr?dinger cat state. In contrast, the pure-phase
relaxation effects, causing a reduction of phase-difference distribution and
then decaying the Schr?dinger cat state, significantly increase with the
increase of the size of Schr?dinger cat state. These features suggest
that a detection of damped collapse-revival behavior is highly possible for
medium-size Schr?dinger cat states in small-size two-component BECs. 相似文献
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量子环中极化子的温度效应 总被引:3,自引:2,他引:1
采用求解能量本征方程和LLP幺正变换方法,研究了量子环中极化子的温度效应.数值计算表明:当温度较低时,温度对极化子的基态能量无影响,当温度较高时,极化子的基态能量随温度的升高而增大;还表明极化子的基态能量随电子-声子耦合强度的增大而减小,随电子受限程度的增强(即量子环内径增大或外径减小)而增大,说明其量子尺寸效应非常显著. 相似文献
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用量子主方程的平均场近似和代数动力学研究玻色-爱因斯坦凝聚体的sympathetic cooling; 用玻色-爱因斯坦凝聚体波函数的运动方程的平均场近似 非线性薛定谔方程研究玻色 爱因斯坦凝聚体的暗孤子和明孤子激发. 相似文献
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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
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Strauch FW Johnson PR Dragt AJ Lobb CJ Anderson JR Wellstood FC 《Physical review letters》2003,91(16):167005
Based on a quantum analysis of two capacitively coupled current-biased Josephson junctions, we propose two fundamental two-qubit quantum logic gates. Each of these gates, when supplemented by single-qubit operations, is sufficient for universal quantum computation. Numerical solutions of the time-dependent Schr?dinger equation demonstrate that these operations can be performed with good fidelity. 相似文献
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暗孤子的周期性再生效应 总被引:1,自引:0,他引:1
通过数值求解变系数非线性薛定谔方程,讨论具有有限背景宽度的皮秒暗光脉冲的传输和相互作用。结果表明,一种新的效应,即暗孤子的周期性再生效应,稳定地存在于具有分布参量的光纤系统中,不会受到孤子间相互作用的影响。并且,这种再生效应对损耗和有限的扰动(如白噪声)等不敏感。这表明暗孤子的周期性再生效应是稳定的。 相似文献
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Bright and dark small amplitude nonlinear localized modes in a quantum one-dimensional Klein--Gordon chain 总被引:1,自引:0,他引:1
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By means of the Glauber's coherent state method combined with multiple-scale method, this paper investigates the localized modes in a quantum one-dimensional Klein-Gordon chain and finds that the equation of motion of annihilation operator is reduced to the nonlinear Schroedinger equation. Interestingly, the model can support both bright and dark small amplitude travelling and non-travelling nonlinear localized modes in different parameter spaces. 相似文献