...
首页> 外文期刊>Journal of physics, A. Mathematical and theoretical >Exact results for fidelity susceptibility of the quantum Ising model: the interplay between parity, system size, and magnetic field
【24h】

Exact results for fidelity susceptibility of the quantum Ising model: the interplay between parity, system size, and magnetic field

机译:量子伊辛模型保真度磁化的精确结果:奇偶校验,系统大小和磁场之间的相互作用

获取原文
获取原文并翻译 | 示例
           

摘要

We derive an exact closed-form expression for fidelity susceptibility of evenand odd-sized quantum Ising chains in a transverse field. To this aim, we diagonalize the Ising Hamiltonian and study the gap between its positive and negative parity subspaces. We derive an exact closed-form expression for the gap and use it to identify the parity of the ground state. We point out the misunderstanding in some of the former studies of fidelity susceptibility and discuss its consequences. Last but not least, we rigorously analyze the properties of the gap. For example, we derive analytical expressions showing its exponential dependence on the ratio between the system size and the correlation length.
机译:我们得出了一个精确的闭合形式的表达式,用于表示横向场中偶数和奇数大小的量子伊辛链的保真度。为此,我们对伊辛哈密顿量进行对角线化,并研究其正负奇偶子空间之间的差距。我们导出间隙的精确闭合形式表达式,并使用它来识别基态的奇偶性。我们指出了对保真度敏感性的一些先前研究中的误解,并讨论了其后果。最后但并非最不重要的一点是,我们严格分析间隙的属性。例如,我们导出分析表达式,表明其对系统大小和相关长度之间的比率呈指数依赖性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号