Measuring postquench entanglement entropy through density correlations
Measuring postquench entanglement entropy through density correlations
复制标题
DOI：
10.1103/physrevresearch.4.l022023
复制
发表时间：
2021-11
影响因子：
4.2
通讯作者：
A. Del Maestro;H. Barghathi;B. Rosenow
中科院分区：
文献类型：
--
作者：
A. Del Maestro;H. Barghathi;B. Rosenow
在一维费米子可积系统中，随着相互作用的突然变化，我们分析了量子猝灭后静态结构因子对观测时间的依赖关系。在短的等待时间后，淬火，我们将系统映射到非相互作用的玻色子，这样我们就能够提取他们的职业数的密度-密度相关函数的傅立叶变换，并使用这些计算玻色子熵从对角合奏。通过比较这个玻色子熵与精确对角化计算的每个费米子的渐近稳态纠缠熵，我们发现很好的协议。
Following a sudden change of interactions in an integrable system of one-dimensional fermions, we analyze the dependence of the static structure factor on the observation time after the quantum quench. At small waiting times after the quench, we map the system to non-interacting bosons such that we are able to extract their occupation numbers from the Fourier transform of the density-density correlation function, and use these to compute a bosonic entropy from a diagonal ensemble. By comparing this bosonic entropy with the asymptotic steady state entanglement entropy per fermion computed with exact diagonalization we find excellent agreement.