Quantum entanglement has been observed at low temperatures in both microscopic and macroscopic systems. It now seems that the effect can also occur at high temperatures if the systems are not in thermal equilibrium.
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Vedral, V. Hot entanglement. Nature 468, 769–770 (2010). https://doi.org/10.1038/468769a
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DOI: https://doi.org/10.1038/468769a
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