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@misc{he2026,
 author={He, Zixuan}, title={{Wigner} entropy below vacuum: physical counterexamples and stability limits},
 year={2026}, howpublished={\href{https://arxiv.org/abs/2609.13312v2}{arXiv:2609.13312v2 [quant-ph]}},
 note={Preprint, version 2, 24 September 2026}
}