Photons immediately spring to mind when we talk about long-distance entanglement. But the spins at the ends of one-dimensional magnetic chains can be entangled over large distances too — providing a solid-state alternative for quantum communication protocols.
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Mitra, C. Long-distance relationship. Nature Phys 11, 212–213 (2015). https://doi.org/10.1038/nphys3249
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DOI: https://doi.org/10.1038/nphys3249
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