Bundling of bipartite entanglement

• URL: http://arxiv.org/abs/2512.16979v1
• Date: Thu, 18 Dec 2025 19:00:00 GMT
• Title: Bundling of bipartite entanglement
• Authors: Maike Drieb-Schoen, Florian Dreier, Wolfgang Lechner,
• Abstract summary: We show that in quantum many-body systems the bipartite entanglement entropy is affected in such a way that it forms "bundles" under unitary time evolution.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate bipartite entanglement and prove that in constrained energy subspaces, the entanglement spectra of multiple bipartitions are the same across the whole subspace. We show that in quantum many-body systems the bipartite entanglement entropy is affected in such a way that it forms "bundles" under unitary time evolution. Leveraging the structure of the subspace, we present methods to verify whether the entanglement spectrum of two bipartitions is identical throughout the entire subspace. For the subspace defined by the parity embedding, we further provide an algorithm that can determine this in polynomial time.

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