Selfcomplementary quantum channels

Marek Smaczynski, Wojciech Roga, Karol Zyczkowski

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
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Selfcomplementary quantum channels are characterized by such an interaction
between the principal quantum system and the environment that leads to the same
output states of both interacting systems. These maps can describe approximate quantum copy machines, as perfect copying of an unknown quantum state is not possible due to the celebrated no-cloning theorem. We provide here a parametrization of a large class of selfcomplementary channels and analyze their properties. Selfcomplementary channels preserve some residual coherences and residual entanglement. Investigating some measures of non-Markovianity, we show that time evolution under selfcomplementary channels is highly non-Markovian.
Original languageEnglish
Pages (from-to)1-26
Number of pages27
JournalOpen Systems & Information Dynamics
Issue number3
Publication statusPublished - 31 Oct 2016


  • principal quantum system
  • quantum channel
  • complementary channel
  • non-Markovian
  • stochastic map

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