Quantum Fisher information and coherence in one-dimensional XY spin models with Dzyaloshinsky-Moriya interactions

• 来源期刊: 中国科学:物理学 力学 天文学（英文版）
• 年，卷（期）: 2018,（11）
• 页码范围: 8-14
• 页数: 7页
• 语种: 英文

摘要

We investigate quantum phase transitions in XY spin models using Dzyaloshinsky-Moriya (DM) interactions.We identify the quantum critical points via quantum Fisher information and quantum coherence,finding that higher DM couplings suppress quantum phase transitions.However,quantum coherence (characterized by the l1-norm and relative entropy) decreases as the DM coupling increases.Herein,we present both analytical and numerical results.