Environmentally induced effects on a bipartite two-level system: Geometric phase and entanglement properties

作     者：Fernando C. Lombardo Paula I. Villar 

作者机构：Departamento de Física Juan José Giambiagi FCEyN UBA Facultad de Ciencias Exactas y Naturales Ciudad Universitaria Pabellón I 1428 Buenos Aires Argentina Computer Applications on Science and Engineering Department Barcelona Supercomputing Center (BSC) 29 Jordi Girona E-08034 Barcelona Spain 

出 版 物：《Physical Review A》 (物理学评论A辑：原子、分子和光学物理学)

年 卷 期：2010年第81卷第2期

页      面：022115-022115页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：UBA CONICET ANPCyT, Argentina 

主　　题：Geometry 

摘      要：We calculate the geometric phase of a bipartite two-level system coupled to an external environment. We analyze the reduced density matrix for an arbitrary initial state of the composite system and compute the correction to the unitary geometric phase through a kinematic approach. In all cases considered, we observe a similar structure as a function of the degree of the entanglement of the initial state. Further, we compute the entanglement entropy and concurrence of the bipartite state and analyze if there is any relation among these quantities and the geometric phase acquired during the nonunitary system’s evolution. Finally, we discuss the results obtained.