Uniform continuity bounds for characteristics of multipartite quantum systems
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 -partite squashed entanglement, c-squashed entanglement and the conditional entanglement of mutual information under the energy constraints.
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