近日，湖南师范大学的胡佳伟&张佳林及其研究小组取得一项新进展。经过不懈努力，他们成功实现从存在反射边界的真空量子场中收集相关性。相关研究成果已于2023年11月24日在国际知名学术期刊《高能物理杂志》上发表。
该研究团队在无限完没反射边界存在的情况下，探索了两个静态探测器与真空无质量标量场局部相互作用所收集到的相关性。研究人员研究了两种探测器-边界排列，即平行-边界排列和正交-边界排列的互信息收集和纠缠收集现象。研究结果表明，相对于无边界的平直时空，边界的存在通常会抑制互信息的收集。相反，边界在纠缠收集中可能起到双刃剑的作用，即在边界近区抑制纠缠收集，而在边界远区促进纠缠收集。
此外，两个不相同的探测器之间存在一个最优的探测器能隙差，只要探测器之间的距离足够大，这种探测器就有利于相关性收集。最优探测器能隙差的取值取决于探测器间的距离和探测器到边界的距离。通过对两种不同排列中相关性收集的比较，可以发现尽管相关性收集在定性上相同，但它们也表现出定量性差异，即正交到边界排列的探测器总是比平行到边界排列的探测器收集相对更多的互信息，而它们只在边界附近收集相对更多的纠缠。
附：英文原文
Title: Harvesting correlations from vacuum quantum fields in the presence of a reflecting boundary
Author: Liu, Zhihong, Zhang, Jialin, Yu, Hongwei
Issue&Volume: 2023-11-24
Abstract: We explore correlations harvesting by two static detectors locally interacting with vacuum massless scalar fields in the presence of an infinite perfectly reflecting boundary. We study the phenomena of mutual information harvesting and entanglement harvesting for two detector-boundary alignments, i.e., parallel-to-boundary and orthogonal-to-boundary alignments. Our results show that the presence of the boundary generally inhibits mutual information harvesting relative to that in flat spacetime without any boundaries. In contrast, the boundary may play a doubled-edged role in entanglement harvesting, i.e., inhibiting entanglement harvesting in the near zone of the boundary while assisting it in the far zone of the boundary. Moreover, there exists an optimal detector energy gap difference between two nonidentical detectors that makes such detectors advantageous in correlations harvesting as long as the interdetector separation is large enough. The value of the optimal detector energy gap difference depends on both the interdetector separation and the detector-to-boundary distance. A comparison of the correlations harvesting in two different alignments shows that although correlations harvesting share qualitatively the same properties, they also display quantitative differences in that the detectors in orthogonal-to-boundary alignment always harvest comparatively more mutual information than the parallel-to-boundary ones, while they harvest comparatively more entanglement only near the boundary.
DOI: 10.1007/JHEP11(2023)184
Source: https://link.springer.com/article/10.1007/JHEP11(2023)184