解离原子与离子之间空间纠缠的比较：顺序双光子吸收与关联双光子吸收导致的分子离子光解离
Comparison of Spatial Entanglement between dissociated atom and ion : molecular ion photo-dissociated by sequential two-photon absorption and correlated two-photon absorption
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中文总结 AI 辅助
该研究比较了氢分子离子两种双光子解离过程的原子与离子空间纠缠保真度，发现光子频率可作为控制参数，且过程具有鲁棒性，还提出了对应的检测方案。
中文摘要 AI 辅助
我们研究了氢分子离子H₂⁺双光子解离产生的解离原子与离子之间空间纠缠的保真度。考虑了分子离子双光子解离的两种过程：(i) 顺序双光子（STP）吸收，以及(ii) 分子离子的关联双光子（CTP）吸收。我们比较了这两种解离类型下，解离原子与离子之间空间纠缠保真度（FSE）的结果。在我们团队之前的一项研究[1]中，我们表明，当原子与电磁场的非局域模式（该模式由场论推导得出）相互作用时，原子会在极短时间δt << ω内发生同时相位关联的双光子吸收，其中ω为激光频率，且这种关联双光子吸收的速率与强度呈线性关系。当相互作用区域的光子通量很高，即激光强度高于10¹⁰ W/cm²时，这种情况会发生。在本工作中，我们扩展了该形式体系，以研究分子离子的关联双光子解离，并探究两个同时发生的光吸收过程之间的关联对解离原子与离子空间纠缠保真度的影响。我们研究了STP和CTP解离两种情况下，空间纠缠保真度对光子频率的依赖性，以证明光子频率可作为实现最大保真度的控制参数。随着计算保真度的时间增加，保真度达到饱和，这表明所考虑过程具有鲁棒性。我们还提出了一种检测离子与原子之间空间纠缠的方案。
英文摘要
We have studied the fidelity of spatial entanglement between dissociated atom and ion from two photon dissociation of hydrogen molecular ion H 2 + . Two processes for two photon dissociation of molecular ion have been considered (i) sequential two photon (STP) absorption and (ii) correlated two photon (CTP) absorption by the molecular ion. We compared the results for fidelity of spatial entanglement (FSE) between dissociated atom and ion for these two types of dissociation. In a previous study in our group [1] we have shown that when an atom interact with nonlocal mode of electromagnetic field (which has been derived field theoretically), simultaneous phase-correlated two pho1 ton absorption by the atom occurs within a very short time δt << ω , where ω is the laser frequency, and the rate of this correlated two photon absorption is linear in intensity. This will happen when the photon flux in the interaction region is high i.e. laser intensity is higher than 10 10 W/cm 2 . In this work we have extended this formalism to study the correlated two photon dissociation of molecular ion and to explore the effect of correlation between two simultaneous photo-absorption processes on the fidelity for spatial entanglement of dissociated atom and ion. Dependence of fidelity for spatial entanglement on the photon frequency has been studied for both the STP and CTP dissociation, to show that photon frequency can be used as control parameter to achieve maximum fidelity. Saturation of fidelity with the increase in time at which fidelity was calculated shows the robustness of the processes considered here. A scheme for detection of spatial entanglement between ion and atom has been suggested.
