期刊
PHYSICAL REVIEW LETTERS
卷 115, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.050501
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资金
- EPSRC
- NSF [CCF-1111382, CCF-1452616]
- ARO [W911NF-12-1-0486]
- Leverhulme Trust
- Sidney Sussex College
- Engineering and Physical Sciences Research Council [EP/J017280/1, EP/J017280/2, EP/K026313/1] Funding Source: researchfish
- EPSRC [EP/J017280/1, EP/J017280/2, EP/K026313/1] Funding Source: UKRI
- Direct For Computer & Info Scie & Enginr
- Division of Computing and Communication Foundations [1452616, 1111382] Funding Source: National Science Foundation
We give two strengthenings of an inequality for the quantum conditional mutual information of a tripartite quantum state recently proved by Fawzi and Renner, connecting it with the ability to reconstruct the state from its bipartite reductions. Namely, we show that the conditional mutual information is an upper bound on the regularized relative entropy distance between the quantum state and its reconstructed version. It is also an upper bound for the measured relative entropy distance of the state to its reconstructed version. The main ingredient of the proof is the fact that the conditional mutual information is the optimal quantum communication rate in the task of state redistribution.
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