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Communications in Mathematical Physics

, Volume 364, Issue 1, pp 83–121 | Cite as

Capacity Estimates via Comparison with TRO Channels

  • Li Gao
  • Marius Junge
  • Nicholas LaRacuente
Article
  • 66 Downloads

Abstract

A ternary ring of operators (TRO) in finite dimensions is an operator space as an orthogonal sum of rectangular matrices. TROs correspond to quantum channels that are diagonal sums of partial traces, we call TRO channels. TRO channels have simple, single-letter entropy expressions for quantum, private, and classical capacity. Using operator space and interpolation techniques,we perturbatively estimate capacities, capacity regions, and strong converse rates for a wider class of quantum channels by comparison to TRO channels.

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Notes

Acknowledgements

We thankMarkM.Wilde for helpful discussions and comments.We thank the anonymous referees for the careful reading and constructive suggestions.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of MathematicsUniversity of IllinoisUrbanaUSA
  2. 2.Department of PhysicsUniversity of IllinoisUrbanaUSA

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