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讨论了强相干激光场驱动下的内腔三能级原子的共振荧光谱,与自由空间情况相比,内腔谱从共振峰为中心向内压缩或向外扩张,但谱线的线型,线宽和强度没有变化,共振峰的线型取决于原子与驱动场之间的失谐程度,文中还谱线特征的形成原因作了分析。 相似文献
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We present explicit unitary transformations for realizing both symmetric and asymmetric one-to-many economical phase-covariant clonings of qudits. We also propose a corresponding telecloning scheme. It is shown that the fidelity of the telecloning with nonmaximally entangled states can be larger than that of the corresponding cloning. This implies that partially entangled states can be better than the maximally entangled states for our economical phase-covariant telecloning scheme. 相似文献
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We propose genuine (k,m)-threshold controlling schemes for controlled teleportation via multi-particle entangled states, where the teleportation of a quantum state from a sender (Alice) to a receiver (Bob) is under the control of m supervisors such that k (k ≤ m) or more of these supervisors can help Bob recover the transferred state. By construction, anyone of our quantum channels is a genuine multipartite entangled state of which any two parts areinseparable. Their properties are compared and contrasted with those of the well-known GHZ, W, and linear cluster states, and also several other genuine multipartite entangled states recently introduced in the literature. 相似文献
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