成大物理系徽
量子資訊專題演講
演講題目: Operator Fideity And Its Applications In Quantum Phase Transitions
演講人: 王曉光 教授
浙江大學物理系
演講時間: 2008 年 12 月 8 日
星期一  上午 12 : 00
演講地點: 物理二館二樓49223
內容摘要:  
We introduce the operator fidelity and propose to use its susceptibility for characterizing the sensitivity of quantum systems to perturbations. Two typical models are addressed: one is the transverse Ising model exhibiting a quantum phase transition, and the other is the one dimensional Heisenberg spin chain with next-nearest-neighbor interactions, which has the degeneracy. It is revealed that the operator fidelity susceptibility is a good indicator of quantum criticality regardless of the system degeneracy.