The emission of a photon by an atom with degenerate levels into a micro-cavity with a single polarization-degenerate mode is studied theoretically with an account of irreversible relaxation of the atom–field system for the atomic excitation by a short laser pulse as well as by means of vacuum-stimulated Raman adiabatic passage. The analytic expressions for the probability of emission of the photon in the cavity and for the photon polarization matrix are derived in the ’strong-coupling’ and ‘bad-cavity’ approximations for arbitrary values of angular momenta of atomic levels. The dependence of the photon polarization on the polarization of the control laser field is studied. It is shown that the degree of photon polarization may be varied from zero (maximum atom–photon entanglement) to unity (disentangled atom and photon) by means of the control-field polarization.

中文翻译：

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具有简并能级的原子的光子发射进入极化简并模的微腔

理论上研究了具有简并能级的原子向单腔简并模态的微腔内发射光子的过程，其中考虑到了短场激光脉冲对原子场系统的不可逆弛豫，从而激发了原子。通过真空刺激的拉曼绝热通道。对于原子级角动量的任意值，以“强耦合”和“坏腔”近似推导腔中光子发射概率和光子极化矩阵的解析表达式。研究了光子偏振对控制激光场偏振的依赖性。