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Wydział Fizyki, Astronomii i Informatyki Stosowanej / Faculty of Physics, Astronomy and Informatics Przeglądanie wg autora "Sarbicki, Gniewomir"

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Wydział Fizyki, Astronomii i Informatyki Stosowanej / Faculty of Physics, Astronomy and Informatics Przeglądanie wg autora "Sarbicki, Gniewomir"

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  • A class of exposed indecomposable positive maps 
    Sarbicki, Gniewomir; Chruściński, Dariusz (2012-11-05)
    Exposed positive maps in matrix algebras define a dense subset of extremal maps. We provide a class of indecomposable positive maps in the algebra of 2n x 2n complex matrices with n>1. It is shown that these maps are exposed ...
  • Constructing new optimal entanglement witnesses 
    Chruściński, Dariusz; Pytel, Justyna; Sarbicki, Gniewomir (2009-07-14)
    We provide a new class of indecomposable entanglement witnesses. In 4 x 4 case it reproduces the well know Breuer-Hall witness. We prove that these new witnesses are optimal and atomic, i.e. they are able to detect the ...
  • Exposed positive maps: a sufficient condition 
    Chruściński, Dariusz; Sarbicki, Gniewomir (2012-03-02)
    Exposed positive maps in matrix algebras define a dense subset of extremal maps. We provide a sufficient condition for a positive map to be exposed. This is an analog of a spanning property which guaranties that a positive ...
  • Optimal entanglement witnesses for two qutrits 
    Chruściński, Dariusz; Sarbicki, Gniewomir (2011-08-02)
    We provide a proof that entanglement witnesses considered recently in [D. Chru\'sci\'nski, F.A. Wudarski, arXiv:1105.4821] are optimal.
  • Spectral conditions for entanglement witnesses vs. bound entanglement 
    Chruściński, Dariusz; Kossakowski, Andrzej; Sarbicki, Gniewomir (2009-08-19)
    It is shown that entanglement witnesses constructed via the family of spectral conditions are decomposable, i.e. cannot be used to detect bound entanglement. It supports several observations that bound entanglement reveals ...