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Uniform continuity bounds for characteristics of multipartite quantum systems

Quantum Physics 2021-09-28 v2 Mathematical Physics math.MP

Abstract

We consider universal methods for obtaining (uniform) continuity bounds for characteristics of multipartite quantum systems. We pay a special attention to infinite-dimensional multipartite quantum systems under the energy constraints. By these methods we obtain continuity bounds for several important characteristics of a multipartite quantum state: the quantum (conditional) mutual information, the squashed entanglement, the c-squashed entanglement and the conditional entanglement of mutual information. The continuity bounds for the multipartite quantum mutual information are asymptotically tight for large dimension/energy. The obtained results are used to prove the asymptotic continuity of the nn-partite squashed entanglement, c-squashed entanglement and the conditional entanglement of mutual information under the energy constraints.

Keywords

Cite

@article{arxiv.2007.00417,
  title  = {Uniform continuity bounds for characteristics of multipartite quantum systems},
  author = {M. E. Shirokov},
  journal= {arXiv preprint arXiv:2007.00417},
  year   = {2021}
}

Comments

30 pages, v.2 is an improved version, any comments are welcome

R2 v1 2026-06-23T16:46:01.634Z