Comparative analysis of entanglement measures based on monogamy inequality

作     者：P J Geetha Sudha K S Mallesh 

作者机构：Department of Physics Kuvempu University Shankaraghatta Shimoga-577 451 India Inspire Institute Inc. Alexandria Virginia 22303 USA Department of Studies in Physics University of Mysore Mysore-570 006 India 

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

年 卷 期：2017年第26卷第5期

页      面：52-59页

核心收录：

学科分类：07[理学] 0809[工学-电子科学与技术（可授工学、理学学位）] 070205[理学-凝聚态物理] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0701[理学-数学] 0702[理学-物理学] 070101[理学-基础数学] 

基　　金：support of the Department of Science and Technology (DST) Govt.of India through the award of the INSPIRE fellowship 

主　　题：entanglement tangle negativity superposition inequality entangled symmetric vanishing squared arbitrary 

摘      要：We evaluate the monogamy inequality for symmetric, non-symmetric pure states of importance in terms of squared concurrence, squared entanglement of formation, squared negativity of partial transpose and compare the corresponding tangles. We show that though concurrence and concurrence tangle are zero for two special classes of mixed entangled states, both negativity tangle and entanglement of formation（EOF） tangle turn out to be non-zero. A comparison of different tangles is carried out in each case and it is shown that while the concurrence tangle captures the genuine multiqubit entanglement in N-qubit pure states with N distinct spinors（containing GHZ and superposition of W-, obverse W states）either negativity tangle or EOF tangle is to be used as a better measure of entanglement in the W-class of states with two distinct spinors and in the special classes of mixed multiqubit states.