Comparative analysis of entanglement measures based on monogamy inequality

• 来源期刊: 中国物理B（英文版）
• 关键词: monogamy of quantum entanglement concurrence tangle negativity tangle Majorana representation of symmetric pure states
• 年，卷（期）: 2017,（5）
• 页码范围: 52-59
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/26/5/050301

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.