论文标题
纠缠突然出生和突然死亡在两个遥远原子的系统中，通过光学元件耦合
Entanglement sudden birth and sudden death in a system of two distant atoms coupled via an optical element
论文作者
论文摘要
据报道，在两个遥远的两个水平原子系统中，研究了集体效应和原子纠缠的动力学，这些原子是通过光学元素耦合的。在正在考虑的系统中，将两个原子捕获在镜头的焦点中，与真空状态的共同环境耦合，它们会自发发射光子。因此，从每个原子发射的光子的一部分集中在另一个原子的位置。两个遥远原子之间的光学元件的存在导致发生延迟的集体效应，例如延迟的偶极偶极子相互作用和延迟的集体自发发射，这在纠缠的动态行为中起着至关重要的作用。我们讨论了纠缠突然出生，纠缠猝死以及纠缠的现象，以及纠缠的初始病例和最初的两个光子未渗透原子状态的现象。我们表明，纠缠的演变不仅对原子间距离，而且对系统的初始状态以及光学元素的特性敏感。
An investigation is reported of the collective effects and the dynamics of atom atom entanglement in a system of two distant two level atoms which are coupled via an optical element. In the system under consideration, the two atoms, which are trapped in the foci of a lens, are coupled to a common environment being in the vacuum state and they emit photons spontaneously. A fraction of the emitted photons from each atom is thus focused on the position of the other atom. The presence of optical element between two distant atoms leads to the occurrence of delayed collective effects, such as delayed dipole dipole interaction and delayed collective spontaneous emission, which play the crucial role in the dynamical behavior of the entanglement. We discuss the phenomena of entanglement sudden birth, entanglement sudden death, and revival of entanglement for both cases of initial one photon and initial two photon unentangled atomic states. We show that the evolution of the entanglement is sensitive not only to the interatomic distance but also to the initial state of the system as well as to the properties of the optical element.
