固定自旋链中的固有量子资源研究
近日，西班牙巴塞罗那科技学院的Maciej Lewenstein及其研究小组与波兰华沙大学的Jan Chwedeńczuk等人合作并取得一项新进展。经过不懈努力，他们对固定自旋链中的固有量子资源进行研究。相关研究成果已于2025年1月9日在国际知名学术期刊《物理评论A》上发表。
该研究团队展示了多体贝尔关联天然存在于多种自旋-1/2链的本征态中。特别地，研究人员证明了集体利普金-梅什科夫-格里克（Lipkin-Meshkov-Glick）模型的本征态和热态具有多体贝尔关联。
研究表明，利普金-梅什科夫-格里克模型本征态中的贝尔关联可以取量化值，这些值会随着总磁化强度的变化而不连续地改变。最后，他们展示了这些多体贝尔关联在同时存在对角和非对角无序的情况下仍然存在。
据悉，生成多体量子关联的标准方法是通过动力学协议：即一个初始的直积态通过相互作用在后续时间演化中生成非经典关联。
附：英文原文
Title: Inherent quantum resources in stationary spin chains
Author: Marcin P?odziee1, Jan Chwedeńczuk2, and Maciej Lewenstein1,3
Issue&Volume: 2025-01-09
Abstract: The standard way to generate many-body quantum correlations is via a dynamical protocol: an initial product state is transformed by interactions that generate nonclassical correlations at later times. Here, we show that many-body Bell correlations are inherently present in the eigenstates of a variety of spin-1/2 chains. In particular, we show that the eigenstates and thermal states of the collective Lipkin-Meshkov-Glick model possess many-body Bell correlations. We demonstrate that the Bell correlations present in the eigenstates of the Lipkin-Meshkov-Glick model can take on quantized values that change discontinuously with variations in the total magnetization. Finally, we show that these many-body Bell correlations persist even in the presence of both diagonal and off-diagonal disorder.
DOI: 10.1103/PhysRevA.111.012417
Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.111.012417
来源：科学网 小柯机器人
