报告摘要：

We propose and demonstrate that the behaviors of long-range, two-site quantum resources can effectively diagnose quantum phases. In an XX spin chain with symmetry-breaking quantum phase transitions, we reveal that the gradually decaying and damped oscillating modes of quantum coherence or quantum discord, along with two-site distance, can identify two spin-liquid phases. Moreover, based on our analytical results of spin correlation functions, we confirm the existence of long-range entanglement in the system and establish a connection between two-site entanglement and quantum phases. Furthermore, for the extended Ising model with topological phase transitions, we find that coherence and quantum discord behaviors can also signify topological quantum phases. In particular, we discover the quantum resource freezing phenomenon, where topologically protected long-range quantum resources may have potential applications in quantum information processing.

报告人简介：

  白彦魁，河北师范大学教授、博士生导师，教育部高校物理学类专业教指委委员（2018-2022），河北省光物理研究与应用重点实验室主任。主要从事量子信息理论研究，在多体量子纠缠相关领域开展了一系列工作，在Physical Review Letters、Physical Review系列、New Journal of Physics等国内外物理学期刊发表SCI论文38篇，先后主持国家自然科学基金和河北省自然科学基金多项，2013年获得“第十一届河北省青年科技奖”，2016年获得“河北省杰出青年科学基金”，2017年获得河北省自然科学二等奖（第一完成人），2020年入选河北省“三三三人才工程”二层次人选。

白彦魁