Journal
COMMUNICATIONS IN MATHEMATICAL PHYSICS
Volume 340, Issue 2, Pages 575-611Publisher
SPRINGER
DOI: 10.1007/s00220-015-2466-x
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Funding
- European Research Council (ERC) [258932]
- Swiss National Science Foundation (SNSF) via the National Centre of Competence in Research QSIT
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A state on a tripartite quantum system forms a Markov chain if it can be reconstructed from its marginal on by a quantum operation from B to . We show that the quantum conditional mutual information I(A : C|B) of an arbitrary state is an upper bound on its distance to the closest reconstructed state. It thus quantifies how well the Markov chain property is approximated.
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