量子临界金属中观测到的放大多体纠缠
Amplified multipartite entanglement witnessed in a quantum critical metal
AI总结：
本研究通过分析Anderson/Kondo晶格模型在Kondo破坏量子临界点附近的量子Fisher信息，揭示了奇异金属中强纠缠的基态，并借助重费米子金属的中子散射实验证实了该发现，为理解金属量子临界性提供了量子信息新视角。
摘要：
物质中的强关联性促进了量子相及其相关量子临界点的景观。对于金属系统，人们越来越认识到量子临界性超越了Landau框架，因此需要新的手段来表征量子临界流体。在此，我们通过研究奇异金属系统中的纠缠量——量子Fisher信息来实现这一点，重点关注Anderson/Kondo晶格模型在其Kondo破坏量子临界点附近的典型情形。自旋量子Fisher信息在量子临界点处达到峰值，表明存在强纠缠的基态。我们的结果得到了从重费米子金属非弹性中子散射测量中提取的量子Fisher信息的支持。我们的工作阐明了奇异金属中准粒子的丢失，开辟了一条量子信息途径以推进对广泛强关联系统中金属量子临界性的理解，并指向一个实现放大纠缠的量子物质新领域。
英文摘要：
Strong correlations in matter promote a landscape of quantum phases and associated quantum critical points. For metallic systems, there is increasing recognition that the quantum criticality goes beyond the Landau framework and, thus, novel means are needed to characterize the quantum critical fluid. Here we do so by studying an entanglement quantity, the quantum Fisher information, in a strange metal system, focusing on the exemplary case of an Anderson/Kondo lattice model near its Kondo destruction quantum critical point. The spin quantum Fisher information peaks at the quantum critical point and indicates a strongly entangled ground state. Our results are supported by the quantum Fisher information extracted from inelastic neutron scattering measurements in heavy fermion metals. Our work elucidates the loss of quasiparticles in strange metals, opens a quantum information avenue to advance the understanding of metallic quantum criticality in a broad range of strongly correlated systems, and points to a novel regime of quantum matter to realize amplified entanglement.
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