Preparation of steady-state entanglement via a laser-excited resonant interaction

• 来源期刊: 中国物理B（英文版）
• 关键词: two-mode entanglement atomic coherence resonant interaction
• 年，卷（期）: 2012,（8）
• 页码范围: 246-251
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/21/8/084206

摘要

In this paper we propose a scheme in which two-mode entanglement in a steady state is produced by using two lasers to resonantly drive a single four-level atom embedded inside a two-mode optical cavity.In this scheme,atomic coherence induced by a classical laser plays an important role in the process of preparing the entangled state.With the coupling of a strong control field,direct two-photon transition is generated and the relatively weak pump field induces the parametric interaction between two photons,which makes then entangle with each other.By numerical calculation,we find that the degree of entanglement depends strongly on the Rabi frequencies of the classical laser fields and the cavity losses.