Quantum Correlation without Entanglement in a Two-Atom-Vacuum Field System  

作　　者：曾可 方卯发 

机构地区：[1]Key Laboratory of Low Dimensional Quantum Structures and Quantum Control (Ministry of Education), Department of Physics, Hunan Normal University, Changsha 410081 [2]Department of Electronic and Communication Engineering, Changsha University, Changsha 410003

出　　处：《Chinese Physics Letters》2014年第11期62-65,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 11374096 and 11074072.

摘　　要：Quantum correlation without entanglement in a two-atom-vacuum field system is investigated. The influence of the atomic dipole-dipole interaction on quantum correlation is also examined. We find that, when both atoms are initially in separable excited states, the quantum discord of two atoms appears while their entanglement wholly vanishes throughout the evolution. We explain our results in detail Our results provide a novel method of achieving a quantum correlation resource without entanglement in the real system.Quantum correlation without entanglement in a two-atom-vacuum field system is investigated. The influence of the atomic dipole-dipole interaction on quantum correlation is also examined. We find that, when both atoms are initially in separable excited states, the quantum discord of two atoms appears while their entanglement wholly vanishes throughout the evolution. We explain our results in detail Our results provide a novel method of achieving a quantum correlation resource without entanglement in the real system.

分 类 号：O413.1[理学—理论物理] TP31[理学—物理]