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理论物理通讯：英文版

Entanglement Properties Between Two Spatially Separated Atoms with Cascade Configuration in Free Space

杨国晖, 张均锋, 苗向阳, 周玲

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

当他们的空间分离大概放射波长或更少时，我们在空间通过延迟的偶极子偶极子相互作用与串联配置调查在二个相同原子之间的纠纷性质。我们分析偶极子偶极子相互作用导致的 Hamiltonian 的功能。由解决主人方程，我们证明自发的排放也导致纠纷和破坏纠纷。我们也在串联配置以内显示出纠纷的长寿时间。

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当他们的空间分离大概放射波长或更少时，我们在空间通过延迟的偶极子偶极子相互作用与串联配置调查在二个相同原子之间的纠纷性质。我们分析偶极子偶极子相互作用导致的 Hamiltonian 的功能。由解决主人方程，我们证明自发的排放也导致纠纷和破坏纠纷。我们也在串联配置以内显示出纠纷的长寿时间。
We investigate the entanglement properties between two identical atoms with cascade configuration through the retarded dipole-dipole interaction in free space when their spatial separation is on the order of radiation wavelength or less. We analyze the function of Hamiltonian induced by dipole-dipole interaction. By solving master equation, we show that the spontaneous emission induce entanglement and destroy entanglement too. We also show the long life time of entanglement within cascade configuration.
We report on the generation of entanglement between two spatially separated identical atoms in free space. We show that the evolution of the entanglement occurs due to the radiative coupling between the two atoms via the retarded dipole-dipole interaction. The magnitude of the entanglement is found to be strongly dependent on the initial states and the distance between the two atoms. We also study the different effects on the entanglement of the dipole-dipole collective parameters in the master equation. By introducing incoherent pumping, a steady entanglement can be acquired, and the condition for generating steady entanglement is also obtained.