铜酸盐链中多体自旋纠缠的观测
Observation of multipartite spin entanglement in a cuprate chain
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中文总结 AI 辅助
利用共振非弹性X射线散射直接提取量子Fisher信息，在铜酸盐链中观测到至少7体自旋纠缠，验证了Hubbard模型预期，为多体纠缠研究提供新探针。
中文摘要 AI 辅助
量子材料被认为承载着高度纠缠的物质态，但探测和量化这种纠缠在实验上长期以来一直难以实现。在此，我们使用共振非弹性X射线散射（RIXS）作为多体自旋纠缠的探针。通过将RIXS截面投影到适当的自旋激发通道上，我们展示了量子Fisher信息可以直接从测量的自旋涨落谱中提取。我们在模型一维铜酸盐Sr$_2$CuO$_3$中检测到至少7体自旋纠缠，揭示了固体中迄今报道的最大纠缠深度之一。观测到的纠缠深度与Hubbard模型的预期一致，并持续到高温。我们的结果确立了RIXS作为多体自旋纠缠的实验探针，并为扩展到电荷和轨道扇区以及非平衡态提供了平台。
英文摘要
Quantum materials are believed to host highly entangled states of matter, but probing and quantifying such entanglement has long remained experimentally elusive. Here, we use resonant inelastic X-ray scattering (RIXS) as a probe of multipartite spin entanglement. By projecting the RIXS cross section onto the appropriate spin excitation channel, we show that the Quantum Fisher Information can be extracted directly from the measured spin fluctuation spectrum. We detect at least 7-partite spin entanglement in the model one-dimensional cuprate Sr$_2$CuO$_3$, revealing one of the largest entanglement depths yet reported in a solid. The observed entanglement depth agrees with Hubbard-model expectations and persists to elevated temperatures. Our results establish RIXS as an experimental probe of many-body spin entanglement and provide a platform for extensions to charge and orbital sectors and nonequilibrium settings.
发表机构
- Harvard University（哈佛大学）
- Emory University（埃默里大学）
- Brookhaven National Laboratory（布鲁克海文国家实验室）
- The University of Tennessee（田纳西大学）
机构由 AI 辅助整理，请以论文原文为准。
