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The entanglement characteristics including the so-called sudden death effect between two identical twolevel atoms trapped in two separate cavities connected by an optical fiber are studied. The results show that the time evolution of entanglement is sensitive not only to the degree of entanglement of the initial state but also to the ratio between cavity-fiber coupling (v) and atom-cavity coupling (g). This means that the entanglement dynamics can be controlled by choosing specific v and ft. 相似文献
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In this paper we propose a scheme for transferring quantum states and preparing quantum networks. Compared with the previous schemes, this scheme is more efficient, since three or four-dimensional quantum states can be transferred with a single step and information interchange of three-dimensional quantum states can be realized, which is a significant improvement. It is based on the resonant interaction of a three-mode cavity field with an atom. As a consequence, the interaction time is shortened greatly. Furthermore, we give some discussions about the feasibility of the scheme. 相似文献
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用最小二乘配点法分析薄板弯曲问题,国内于1978年首先由徐次达、施德芳用幂级数作为挠度试函数进行了解算.1979年何广乾、张维岳成功地以最小二乘边界配点法解算了壳体的线性弯曲问题.本文系用最小二乘内部配点法解算薄板几何非线性弯曲问题,所用挠度试函数为双三角级数,以边界可动简支方形柔韧板为例进行计算,在解非线性方程组时采用Levenberg-Marguardt法(阻尼最小二乘法),克服方程组的奇异性和病态.计算结果与Levy的成果进行了比较. 相似文献
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拜读了《数学通讯》2009年1、2月(学生刊)王增强老师的“用贝努利不等式的变式证一类不等式题”.颇有收获.但觉得证明的变形技巧要求太高,也比较繁琐,下面用柯西不等式的一个推论给出该文几例的简证,为便于说明问题并再添加几例(例1至例5是原文顺序例题,例6至例9是另选例题). 相似文献
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We investigate the entanglement dynamics of two initially entangled atoms each interacting with a thermal field.We show that the two entangled atoms become completely disentangled in a finite time and that the lost information cannot return to the atomic system when the mean photon number of the thermal field exceeds a critical value (3.3584),even though the whole system is lossless.Then we study how the detuning between the atomic transition frequency and the field frequency and the disparity between two coupling rates would affect the evolution of the entanglement of the atomic system. 相似文献
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