Tetrapartite entanglement measures of W-class in noninertial frames

作     者：Ariadna J. Torres-Arenas Edgar O. Lopez-Zuniga J. Antonio Saldana-Herrera Qian Dong Guo-Hua Sun Shi-Hai Dong 

作者机构：Laboratorio de Información Cuantica CIDETEC Instituto Politecnico Nacional UPALM CDMX 07700 Mexico Facultad de Ciencias Fisico Matematicas Universidad Autónoma de Nuevo Leon San Nicolas de los Garza NL 66450 Mexico Catedratica CONACyT Centro de Investigacion en Computacion Instituto Politecnico Nacional UPALM CDMX 07738 Mexico 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2019年第28卷第7期

页      面：122-130页

核心收录：

学科分类：07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0702[理学-物理学] 

基　　金：Project partially supported by the CONACYT,Mexico under the Grant No.288856-CB-2016 partially by 20190234-SIP-IPN,Mexico partially by the program XXVIII Verano de la Investigación Científica 2018 supported by the Academia Mexicana de Ciencias 

主　　题：W-class tetrapartite entanglement Dirac field noninertial frames nonuniform acceleration 

摘      要：We present the entanglement measures of a tetrapartite W-class entangled system in a noninertial frame, where the transformation between Minkowski and Rindler coordinates is applied.Two cases are considered.First, when one qubit has uniform acceleration whilst the other three remain stationary.Second, when two qubits have nonuniform accelerations and the others stay inertial.The 1–1 tangle, 1–3 tangle, and whole entanglement measurements π4 and Π4, are studied and illustrated with graphics through their dependence on the acceleration parameter rd for the first case and rc and rd for the second case.It is found that the negativities(1–1 tangle and 1–3 tangle) and π-tangle decrease when the acceleration parameter rd or in the second case rc and rd increase, remaining a nonzero entanglement in the majority of the results.This means that the system will be always entangled except for special cases.It is shown that only the 1–1 tangle for the first case vanishes at infinite accelerations, but for the second case the 1–1 tangle disappears completely when r 0.472473.An analytical expression for the von Neumann information entropy of the system is found and we note that it increases with the acceleration parameter.