Communications in Mathematical Physics

, Volume 328, Issue 3, pp 995–1021 | Cite as

Asymptotically Well-Behaved Input States Do Not Violate Additivity for Conjugate Pairs of Random Quantum Channels

Article

Abstract

It is now well-known that, with high probability, the additivity of minimum output entropy does not hold for pairs of the random quantum channel and its complex conjugate. We investigate asymptotic behavior of output states of r-tensor powers of such pairs, as the dimension of inputs grows. We compute the limit output states for any sequence of well-behaved inputs, which consist of a large class of input states having a nice set of parameters. Then, we show that among these input states tensor products of Bell states give asymptotically the least output entropy, giving positive mathematical evidence towards additivity of above pairs of channels.

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© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Zentrum Mathematik, M5Technische Universität MünchenGarchingGermany
  2. 2.CNRS, Laboratoire de Physique Théorique, IRSAMCUniversité de Toulouse, UPSToulouseFrance

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