Observation of multipartite spin entanglement in a cuprate chain
Abstract
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 Sr2CuO3, 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.
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BibTeX
@misc{tenhuisen2026observation,
title = {{Observation of multipartite spin entanglement in a cuprate chain}},
author = {S. F. R. TenHuisen and Z. Shen and V. Bhartiya and V. Menon and P. Sharma and H. Padma and Z. Guan and W. He and M. K. Lajer and J. Li and D. Banerjee and J. Pelliciari and I. A. Zaliznyak and G. D. Gu and M. D. Lukin and S. Johnston and M. P. M. Dean and V. Bisogni and Y. Wang and M. Mitrano},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.08134},
eprint = {2609.08134},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.08134},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Observation of multipartite spin entanglement in a cuprate chain
AU - S. F. R. TenHuisen
AU - Z. Shen
AU - V. Bhartiya
AU - V. Menon
AU - P. Sharma
AU - H. Padma
AU - Z. Guan
AU - W. He
AU - M. K. Lajer
AU - J. Li
AU - D. Banerjee
AU - J. Pelliciari
AU - I. A. Zaliznyak
AU - G. D. Gu
AU - M. D. Lukin
AU - S. Johnston
AU - M. P. M. Dean
AU - V. Bisogni
AU - Y. Wang
AU - M. Mitrano
PY - 2026
DA - 2026/09/08
PB - arXiv
DO - 10.48550/arxiv.2609.08134
UR - https://arxiv.org/abs/2609.08134
AB - 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_2CuO_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.
ER -