论文标题
来自亚稳定原子的两光子衰减的attosond纠缠光子：attosecond实验的来源
Attosecond Entangled Photons from Two-Photon Decay of Metastable Atoms: A Source for Attosecond Experiments and Beyond
论文作者
论文摘要
我们提出，通过亚稳态原子态的两光子衰减，作为一种类似于自发参数下转化光子的来源，我们提出了极端粉状物质中的纠缠双光子的产生。 1S2S $^1S_0 $在氦气状态下以氦气状态衰减的状态通过两个能量时纠缠的光子发射，其光子带宽等于20.62 eV的总能量间距。这导致在Attosendemime中的一对相关时间，使这些纠缠的光子成为高度合适的泵浦探针实验的来源。计算从直接四个光子激发氦气激发240 nm的双光子发电率，并用于评估一些可行方案以生成这些双光子。提出了纠缠双光子在Attosentime量表实验中的可能应用，并讨论了它们达到Zeptsecond制度的潜力。
We propose the generation of attosecond entangled bi-photons in the extreme-ultraviolet regime by two-photon decay of a metastable atomic state as a source similar to spontaneous parametric down-conversion photons. The 1s2s $^1S_0$ metastable state in helium decays to the ground state by emission of two energy-time entangled photons with a photon bandwidth equal to the total energy spacing of 20.62 eV. This results in a pair correlation time in the attosecond regime making these entangled photons a highly suitable source for attosecond pump-probe experiments. The bi-photon generation rate from a direct four photon excitation of helium at 240 nm is calculated and used to assess some feasible schemes to generate these bi-photons. Possible applications of entangled bi-photons in attosecond time scale experiments, and a discussion of their potential to reach the zeptosecond regime are presented.
