Journal
PHYSICAL REVIEW LETTERS
Volume 124, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.100501
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Funding
- University of Cambridge Isaac Newton Trust Early Career Grant [RG74916]
- French National Research Agency [ANR-18-CE47-0011]
- Swiss National Science Foundation via the NCCR QSIT [200020_165843]
- Air Force Office of Scientific Research Grant [FA9550-19-1-0202]
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The chain rule for the classical relative entropy ensures that the relative entropy between probability distributions on multipartite systems can be decomposed into a sum of relative entropies of suitably chosen conditional distributions on the individual systems. Here, we prove a chain rule inequality for the quantum relative entropy. The new chain rule allows us to solve an open problem in the context of asymptotic quantum channel discrimination: surprisingly, adaptive protocols cannot improve the error rate for asymmetric channel discrimination compared to nonadaptive strategies.
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