Comment on "Conditional Decoupling of Quantum Information"

Abstract

Berta et al [Phys. Rev. Lett., 121, 040504 (2018)] claim that their result provides a conceptually new extension of the decoupling approach to quantum information theory. We provide an alternate proof using the plain-vanilla decoupling approach for the achievable rates of their main result and hence, their claim is unwarranted, and the title can be misleading when taken in conjunction with the claim.

arXiv comment6 pages

References in corpus (4)

• On the quantum, classical and total amount of correlations in a quantum state
• The exact cost of redistributing multipartite quantum states
• Relating different quantum generalizations of the conditional Renyi entropy
• Random coding exponents galore via decoupling