Spontaneous emission from a three-level atom embedded in anisotropic photonic band gap structures
Spontaneous emission from a three-level atom embedded in anisotropic photonic band gap structures
复制标题
嵌入各向异性光子带隙结构中的三能级原子的自发发射
DOI：
10.1080/09500340408232506
复制
发表时间：
2004
影响因子：
1.3
通讯作者：
A. Okamoto
中科院分区：
文献类型：
--
作者：
H. Nihei;A. Okamoto
摘要：我们研究了嵌入在实际的各向异性光子带隙结构中的三能级原子的自发发射，其中带边缘被假设在原子的两个上能级之间。在各向异性模型中，原子场相互作用减小到比理想各向同性模型中的小，从而减少了自发发射中的抑制和振荡效应；然而，我们证明了即使在各向异性模型中，通过扩大上层和带边缘之间的失谐，抑制也得到了强烈的增强，而振荡则大大减少。这个演示是通过计算大范围失谐的原子状态向量来实现的。利用状态向量，分别研究了局域部分和传播部分两个场的原子场相互作用。对于局域部分，尽管存在各向异性，但通过扩大失谐可以增强原子与场的相互作用，从而产生较强的抑制效应，而对于传播部分，原子与场的相互作用减弱，从而产生较弱的振荡效应。这一结果与高速交换的强记忆效应有关，这是量子比特的诱人特性。
Abstract We investigate spontaneous emissions from a three-level atom embedded in realistic anisotropic photonic band gap structures, where the band edge is assumed to be midway between the two upper levels of the atom. In the anisotropic model, the atom-field interaction is reduced to be smaller than that in the ideal isotropic model, which results in the reduction of suppression and oscillation effects in the spontaneous emission; however, we demonstrate that the suppression is strongly enhanced even in the anisotropic model by expanding the detuning between the upper level and the band edge, while the oscillation is greatly reduced. This demonstration is carried out by calculating the atomic state vector for a wide range of the detuning. Using the state vector, the atom-field interaction is studied for two field parts, a localized part and a propagating part, separately. For the localized part, the atom-field interaction is enhanced by expanding the detuning, in spite of the anisotropy, which leads to a strong suppression effect, while for the propagating part, the atom-field interaction is reduced, which leads to a weak oscillation effect. This result is relevant to strong memory effects with high-speed switching, which are attractive properties for a qubit.