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Multi-mode cavities have now attracted much attention both experimentally and theoretically. In this paper, inspired by recent experiments of cavity-assisted Raman transitions, we realize a two-axis spin Hamiltonian H = q(J_x~2+ χJ_y~2) + ω_0J_z in two cavities. This realized Hamiltonian has a distinct property that all parameters can be tuned independently. For proper parameters, the well-studied one- and two-axis twisting Hamiltonians are recovered, and the scaling of N~(-1) of the maximal squeezing factor can occur naturally. On the other hand, in the two-axis twisting Hamiltonian, spin squeezing is usually reduced when increasing the atomic resonant frequency ω_0. Surprisingly, we find that by combining with the dimensionless parameter χ(-1), this atomic resonant frequency ω_0 can enhance spin squeezing greatly. These results are beneficial for achieving the required spin squeezing in experiments. 相似文献
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本文主要研究能用于干涉光谱测量的分波阵面干涉仪的原理,建立理论模型,并采用标量电场复振幅计算干涉仪的远场干涉光强分布,其结果很接近光栅.文章讨论了波长、周期常量、周期数与衍射角的关系,并讨论了干涉图的探测.理论计算的结果由相应的实验结果加以证实.另外文章对光程扫描方式进行了比较和讨论. 相似文献
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Digital image difference method monitorring coating status of microsphere targets automatically is suggested. A CCD micro-imaging system is developed for monitoring the status of bouncing and adherence between microspheres and the bouncing pan. A new bouncing pan with multiple holes is adopted for microsphere coating to enhance the microsphere coating efficiency. 相似文献
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