Prof. Yan-Chao Li
University of Chinese Academy of Sciences, China
Quantum discord and quantum coherence study on quantum phase transitions
Pairwise quantum discord (QD) and quantum cohernce (QC), based on Wigner-Yanaseskewinformation, are studied in different systems, such as the one-dimentional Hubbard model,the XY spin chain with three-spin interaction system, and the Su-Schriffer-Heeger model. We analyze their capability in detecting quantum phase transitions (QPTs) at both zero and finitetemperatures and find that the pairwise QD of two neighboring spins is more reliable than that of any otherdistances in identifying QPTs. Both the QD and QC detect quantum critical points associated with first- and higher-order QPTs. Furthermore, the QC is found to be as effective asthe quantum discord (QD) in detecting QPTs at finite temperatures, where the entanglement haslost its effectiveness. In addition, we show that the LQC could exhibit different behaviors in manyways with that of the QD.
Yan-Chao Li obtained his Master Degree from of Hua-zhongUniversity of Science and Technology in 2006, and received his Ph.D. from Institute of Semiconductors, Chinese Academy of Sciences (2010). He went to Beijing Computational Science Research Centeras a postdoc (2010-2012). In 2013he joined College of Materials Science and Opto-Electronic Technology in University of Chinese Academy of Sciencesas a lecturer. His main research interests focus on quantum phase transitions of one-dimensional systems, strongly correlated systems, and disorder and magnetic field effects in superconductors. He pointed out a density-matrix Loschmidt echo method, and proved it is a convenient wayto connect with the density matrix renormalization group technique (DMRG) to detect different types of quantum phase transition. In addition, he analyzed the capability of the pairwise quantum discord (QD) in detecting quantum phase transitions (QPTs) at both zero and finite temperatures, and found that, in contrast to entanglement, it can be used to detect critical points of QPTs at a relative high temperature.This paper has been cited more than 50 times since 2011.
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