All unital qubit channels are 4-noisy operations

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Documents

  • Alexander Müller-Hermes
  • Christopher Perry

We show that any unital qubit channel can be implemented by letting the input system interact unitarily with a four-dimensional environment in the maximally mixed state and then tracing out the environment. We also provide an example where the dimension of such an environment has to be at least 3.

Original languageEnglish
JournalLetters in Mathematical Physics
Volume109
Issue number1
Pages (from-to)1-9
ISSN0377-9017
DOIs
Publication statusPublished - 2019

    Research areas

  • Factorizable maps, Noisy operations, Open quantum systems, Operator Schmidt rank, Quantum channels

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