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当He原子入射能量E=0.05eV时,计算了He-H2碰撞弹性散射(00-00)和第一激发态(00-02)的角分布(微分散射截面)。最多计算50个分波,使弹性散射和碰撞激发的散射截面收敛。 相似文献
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The system of electrons on liquid helium is an interesting candidate to implement quantum computation, due to the long coherence times of the qubits encoded by the electronic spins. In order to implement the quantum logic operations between the spins, we propose here a configuration, similarly to the cooled ions in a trap, to couple the distant electrons via manipulating their center of mass (CM) vibrations. First, we show that the electrons could be confined in a common harmonic oscillator potential by using an electrostatic field. Then, with a single current pulse (applied on the micro-electrode below the liquid helium) the distant electronic spins can be coupled simultaneously to the CM mode. Finally, by adiabatically eliminating the CM mode, effective interaction between the distant spins is induced for implementing the desired quantum computing. 相似文献
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拟合及预测饱和增长趋势的广义逻辑(Logistic)曲线模型 总被引:6,自引:0,他引:6
本文讨论了逻辑(Logistic)曲线与龚柏兹(Gompertz)曲线模型结构上的缺点。针对这些缺点,文中提出利用广义逻辑曲线模型拟合及预测饱和增长趋势,解释了该模型包含的实际经济意义,并给出了相应的参数估计算法,以实例说明了该模型具有高于逻辑曲线和龚柏兹曲线的预测精度。 相似文献